Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Thanks Jaime, I figured out those speaker connectors behind the radio are indeed the rear speaker connectors, so I can use jumpers through the fader connector for the front speaker (+) signal, now I need to figure out the (-) signal. -- Max Dillon Charleston SC '87 300TD '95 E300 On June 19, 2015 7:46:12 PM EDT, Jaime Kopchinski via Mercedes mercedes@okiebenz.com wrote: Hi Meade, You can easily bypass the fader switch... In earlier cars (which I'm familiar with) the fader switch wiring harness has connections to the rear speakers in the center console. If you work with the wire, you can stretch them up to the radio. No need to run new wires to the rear. I run new wiring to the fronts, since the factory wiring is part of the factory fader harness. Normally I do this with out cutting anything (I have lots of the male factory speaker connectors, and access to the original crimp tool for them) so I can return the car to original. The original style speaker connectors are labeled + and - if you look very carefully at the plastic pieces. Good luck! Jaime ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Meade wrote: I'm concerned because I've read in several forum posts that modern radios don't like how Mercedes grounded the speakers in the 80's, now I need to see how the Becker 1492 installation compares to my 87 wagon, maybe in '94/'95 Mercedes continued with its speaker grounding method and the 1492 won't care. Ah. They grounded one side of the speaker line - huh? *shakes head* Not a good idea. Oh well. It is what it is. You might be able to test your 1492 with a meter. Measure the resistance between the various speaker - terminal. Also measure from the - terminal to chassis ground. Probably should check both polarities. Compare that to the same test procedure done with the + terminals. If the amp output is NOT ground referenced, the two could be similar. I don't know what values to expect. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Meade wrote: ...should I combine the front and rear signals (more power) to feed the fader? Bad idea. If the amplifier sections are designed appropriately, it's possible to combine them - but you either get double the current or double the voltage and without changing the speaker impedance you likely won't get much more power. And most likely, the amplifier sections are NOT designed that way. In which case the amp outputs fight each other and all the power goes into destroying the amp rather than out the speakers. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Speakers were not grounded from the factory. Beware if this is the case. Jaime On Saturday, June 20, 2015, fmiser via Mercedes mercedes@okiebenz.com wrote: Meade wrote: I'm concerned because I've read in several forum posts that modern radios don't like how Mercedes grounded the speakers in the 80's, now I need to see how the Becker 1492 installation compares to my 87 wagon, maybe in '94/'95 Mercedes continued with its speaker grounding method and the 1492 won't care. Ah. They grounded one side of the speaker line - huh? *shakes head* Not a good idea. Oh well. It is what it is. You might be able to test your 1492 with a meter. Measure the resistance between the various speaker - terminal. Also measure from the - terminal to chassis ground. Probably should check both polarities. Compare that to the same test procedure done with the + terminals. If the amp output is NOT ground referenced, the two could be similar. I don't know what values to expect. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Jaime Kopchinski http://www.jaimekop.com/ ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Max, The fader on my 123 just plugs into the wiring right under it. Makes it easy to replace and to run new wires from the radio to that plug. No need to look for any other plug in point. Manfred Date: Fri, 19 Jun 2015 15:21:35 -0400 From: Meade Dillon dillonm...@gmail.com The easiest of all will be finding the rear speaker wire connections, hopefully in the center console and accessible without too much trouble. If I can find those, then I can connect the radio directly to the speakers, bypassing the fader. - Max Charleston SC On Fri, Jun 19, 2015 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Hi Meade, You can easily bypass the fader switch... In earlier cars (which I'm familiar with) the fader switch wiring harness has connections to the rear speakers in the center console. If you work with the wire, you can stretch them up to the radio. No need to run new wires to the rear. I run new wiring to the fronts, since the factory wiring is part of the factory fader harness. Normally I do this with out cutting anything (I have lots of the male factory speaker connectors, and access to the original crimp tool for them) so I can return the car to original. The original style speaker connectors are labeled + and - if you look very carefully at the plastic pieces. Good luck! Jaime On Thu, Jun 18, 2015 at 10:39 PM, Meade Dillon via Mercedes mercedes@okiebenz.com wrote: Jaime, The aftermarket Sony radio in my '87 wagon finally died, and whomever installed it really hacked up the factory wiring. Some of the original connectors appear to be there, I found two. Looks like the factory radio should have been a Becker Grand Prix, model 754. I've got a spare Becker 1492, which I'd like to install. This afternoon I went by a local pick-n-pull and from a W202 I cut the radio connectors and about a foot of the factory wiring, so I have connectors that fit into the back of the 1492 including the CD changer port. Q1: What to do with the nearly-dead fader switch in the center console? Should I bypass, or bite the bullet and get a new fader switch. If bypass, have you got a wiring diagram? I have already tried a thorough cleaning with De-Ox-It, which helped a little, but it is still pretty miserable. Q2: The 1492 has a connection port for a CD changer, but I have no such thing in the wagon. Have you a wiring diagram so I can make an aux input connection? - Max Charleston SC ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Jaime Kopchinski http://www.jaimekop.com/ ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
I think those fader swithces are just variable resistors/potentiometer things. put a meter on it and see what it does. Newer head units (I don't mean Beckers -- no idea what they have -- but any other thing you buy) have the fader built in so you can just bypass it and use the native function. Again, I don't know about Beckers but I was looking at the schematic for the radio in my truck, which I liberated from the 2000 Suburban when I put a new unit in there. I want to put an aux input for an ipod or a bluetooth module, and the way to do that is to tap into the cassette line. The unit itself has a remote cassette player that uses that line so just a matter of putting the wires and a mini-plug socket somewhere near the unit. Of course this is on my to-do list... Some people have found success by just opening up the unit and looking at the board or inputs and just tapping/splicing into the proper wire or trace or plug or something on the main board -- apparently most of them are annotated on the boards or it is easy enough to see what goes where. --R On 6/19/15 7:53 AM, Meade Dillon via Mercedes wrote: Dan, Thanks for that info on the CD changer port. I've got a couple of old CD changers, not sure if either works, maybe I can enlist Rich to figure out what the CD changer is saying to the radio to make the CD input active. I have seen a couple of hacks to solder the aux cables to the cassette tape board, that doesn't look too bad. One hack required that a gutted tape be inserted in the tape player to make the tape input active, but I wonder if the radio would then count down the 30 hours and then call for the head cleaning. I still need to decide how to tackle the fader switch. Perhaps the only redeeming feature of the so-called installation job done to the car earlier is that they didn't mess with the fader switch and wiring. If I keep the fader switch, do I only feed it the front speaker signals from the 1492, or should I combine the front and rear signals (more power) to feed the fader? My gut tells me that combining the signals is a bad idea, so if no one can answer that I'll probably only feed either the front or the rear signals to the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 5:40 AM, Dan Penoff via Mercedes mercedes@okiebenz.com wrote: Max, In researching possible mods to the 1492s in my W140 chassis cars, I looked at the CD changer inputs and determined that they cannot be used for auxiliary inputs. This is due to the need for a signal to be coming back from the changer for the changer input to be active. It’s not something you can “fake”, either. I believe the Becker folks do it by connecting to the tape head on the cassette player section in order to get it to work. Dan ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
If you leave the fader connected for the rears, a rear-seat passenger can lean forward and turn down his own volume when you're making it too loud in back! -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Thanks Rich. I think the easy route will be to bypass the fader, I'd like to figure out how to do that without cutting off the fader connector so that it can be restored to stock in the future. I'm not having much luck finding a DIY on the intertubes for which pins to jumper (or run new wires to) in order to route sound signal to the rear speakers. Aux input: yes, it looks like hacking into the cassette board will be the best option, if I can't figure out how to use the CD changer inputs. I'm not sure how to approach that yet, may need an o-scope to sample the signals. - Max Charleston SC On Fri, Jun 19, 2015 at 9:20 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: I think those fader swithces are just variable resistors/potentiometer things. put a meter on it and see what it does. Newer head units (I don't mean Beckers -- no idea what they have -- but any other thing you buy) have the fader built in so you can just bypass it and use the native function. Again, I don't know about Beckers but I was looking at the schematic for the radio in my truck, which I liberated from the 2000 Suburban when I put a new unit in there. I want to put an aux input for an ipod or a bluetooth module, and the way to do that is to tap into the cassette line. The unit itself has a remote cassette player that uses that line so just a matter of putting the wires and a mini-plug socket somewhere near the unit. Of course this is on my to-do list... Some people have found success by just opening up the unit and looking at the board or inputs and just tapping/splicing into the proper wire or trace or plug or something on the main board -- apparently most of them are annotated on the boards or it is easy enough to see what goes where. --R ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
You could just clip a jumper across the terminals for each side and turn the fader off -- that will create the easy path for the electrons to flow. Won't bugger the switch. --R On 6/19/15 9:26 AM, Meade Dillon via Mercedes wrote: Thanks Rich. I think the easy route will be to bypass the fader, I'd like to figure out how to do that without cutting off the fader connector so that it can be restored to stock in the future. I'm not having much luck finding a DIY on the intertubes for which pins to jumper (or run new wires to) in order to route sound signal to the rear speakers. Aux input: yes, it looks like hacking into the cassette board will be the best option, if I can't figure out how to use the CD changer inputs. I'm not sure how to approach that yet, may need an o-scope to sample the signals. - Max Charleston SC On Fri, Jun 19, 2015 at 9:20 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: I think those fader swithces are just variable resistors/potentiometer things. put a meter on it and see what it does. Newer head units (I don't mean Beckers -- no idea what they have -- but any other thing you buy) have the fader built in so you can just bypass it and use the native function. Again, I don't know about Beckers but I was looking at the schematic for the radio in my truck, which I liberated from the 2000 Suburban when I put a new unit in there. I want to put an aux input for an ipod or a bluetooth module, and the way to do that is to tap into the cassette line. The unit itself has a remote cassette player that uses that line so just a matter of putting the wires and a mini-plug socket somewhere near the unit. Of course this is on my to-do list... Some people have found success by just opening up the unit and looking at the board or inputs and just tapping/splicing into the proper wire or trace or plug or something on the main board -- apparently most of them are annotated on the boards or it is easy enough to see what goes where. --R ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Dan, Thanks for that info on the CD changer port. I've got a couple of old CD changers, not sure if either works, maybe I can enlist Rich to figure out what the CD changer is saying to the radio to make the CD input active. I have seen a couple of hacks to solder the aux cables to the cassette tape board, that doesn't look too bad. One hack required that a gutted tape be inserted in the tape player to make the tape input active, but I wonder if the radio would then count down the 30 hours and then call for the head cleaning. I still need to decide how to tackle the fader switch. Perhaps the only redeeming feature of the so-called installation job done to the car earlier is that they didn't mess with the fader switch and wiring. If I keep the fader switch, do I only feed it the front speaker signals from the 1492, or should I combine the front and rear signals (more power) to feed the fader? My gut tells me that combining the signals is a bad idea, so if no one can answer that I'll probably only feed either the front or the rear signals to the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 5:40 AM, Dan Penoff via Mercedes mercedes@okiebenz.com wrote: Max, In researching possible mods to the 1492s in my W140 chassis cars, I looked at the CD changer inputs and determined that they cannot be used for auxiliary inputs. This is due to the need for a signal to be coming back from the changer for the changer input to be active. It’s not something you can “fake”, either. I believe the Becker folks do it by connecting to the tape head on the cassette player section in order to get it to work. Dan ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Max, In researching possible mods to the 1492s in my W140 chassis cars, I looked at the CD changer inputs and determined that they cannot be used for auxiliary inputs. This is due to the need for a signal to be coming back from the changer for the changer input to be active. It’s not something you can “fake”, either. I believe the Becker folks do it by connecting to the tape head on the cassette player section in order to get it to work. Dan On Jun 18, 2015, at 10:39 PM, Meade Dillon via Mercedes mercedes@okiebenz.com wrote: Jaime, The aftermarket Sony radio in my '87 wagon finally died, and whomever installed it really hacked up the factory wiring. Some of the original connectors appear to be there, I found two. Looks like the factory radio should have been a Becker Grand Prix, model 754. I've got a spare Becker 1492, which I'd like to install. This afternoon I went by a local pick-n-pull and from a W202 I cut the radio connectors and about a foot of the factory wiring, so I have connectors that fit into the back of the 1492 including the CD changer port. Q1: What to do with the nearly-dead fader switch in the center console? Should I bypass, or bite the bullet and get a new fader switch. If bypass, have you got a wiring diagram? I have already tried a thorough cleaning with De-Ox-It, which helped a little, but it is still pretty miserable. Q2: The 1492 has a connection port for a CD changer, but I have no such thing in the wagon. Have you a wiring diagram so I can make an aux input connection? - Max Charleston SC ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
The issue is that the fader gets two-channel input (only two wires), and outputs four-channels (only four wires). The _ground_ or _negative_ signal to the speakers doesn't go through the fader, it goes from the radio through connector X48H and X48G, which are not listed in the FSM index of connector locations. I suspect they are somewhere under the center console. So I would need to run two more wires to that fader socket for either the front or the rear speakers, OR I could go directly to the front speakers from the radio (those connectors are readily available right behind the radio hole), and then jumper the fader input wires to the rear speaker signals. Unfortunately the electrical diagram from the FSM does not give pin numbers at the fader socket, so I guess that will be trial and error with a 9v battery. I'm concerned because I've read in several forum posts that modern radios don't like how Mercedes grounded the speakers in the 80's, now I need to see how the Becker 1492 installation compares to my 87 wagon, maybe in '94/'95 Mercedes continued with its speaker grounding method and the 1492 won't care. I'd like to put the Aux Input plug in the hole for the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 9:44 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: You could just clip a jumper across the terminals for each side and turn the fader off -- that will create the easy path for the electrons to flow. Won't bugger the switch. --R On 6/19/15 9:26 AM, Meade Dillon via Mercedes wrote: Thanks Rich. I think the easy route will be to bypass the fader, I'd like to figure out how to do that without cutting off the fader connector so that it can be restored to stock in the future. I'm not having much luck finding a DIY on the intertubes for which pins to jumper (or run new wires to) in order to route sound signal to the rear speakers. Aux input: yes, it looks like hacking into the cassette board will be the best option, if I can't figure out how to use the CD changer inputs. I'm not sure how to approach that yet, may need an o-scope to sample the signals. - Max Charleston SC On Fri, Jun 19, 2015 at 9:20 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: I think those fader swithces are just variable resistors/potentiometer things. put a meter on it and see what it does. Newer head units (I don't mean Beckers -- no idea what they have -- but any other thing you buy) have the fader built in so you can just bypass it and use the native function. Again, I don't know about Beckers but I was looking at the schematic for the radio in my truck, which I liberated from the 2000 Suburban when I put a new unit in there. I want to put an aux input for an ipod or a bluetooth module, and the way to do that is to tap into the cassette line. The unit itself has a remote cassette player that uses that line so just a matter of putting the wires and a mini-plug socket somewhere near the unit. Of course this is on my to-do list... Some people have found success by just opening up the unit and looking at the board or inputs and just tapping/splicing into the proper wire or trace or plug or something on the main board -- apparently most of them are annotated on the boards or it is easy enough to see what goes where. --R ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Probably easier to just snake new wires back to the speakers and then connect directly to the head unit or the connector or whatever you can get to --R On 6/19/15 10:33 AM, Meade Dillon via Mercedes wrote: The issue is that the fader gets two-channel input (only two wires), and outputs four-channels (only four wires). The _ground_ or _negative_ signal to the speakers doesn't go through the fader, it goes from the radio through connector X48H and X48G, which are not listed in the FSM index of connector locations. I suspect they are somewhere under the center console. So I would need to run two more wires to that fader socket for either the front or the rear speakers, OR I could go directly to the front speakers from the radio (those connectors are readily available right behind the radio hole), and then jumper the fader input wires to the rear speaker signals. Unfortunately the electrical diagram from the FSM does not give pin numbers at the fader socket, so I guess that will be trial and error with a 9v battery. I'm concerned because I've read in several forum posts that modern radios don't like how Mercedes grounded the speakers in the 80's, now I need to see how the Becker 1492 installation compares to my 87 wagon, maybe in '94/'95 Mercedes continued with its speaker grounding method and the 1492 won't care. I'd like to put the Aux Input plug in the hole for the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 9:44 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: You could just clip a jumper across the terminals for each side and turn the fader off -- that will create the easy path for the electrons to flow. Won't bugger the switch. --R On 6/19/15 9:26 AM, Meade Dillon via Mercedes wrote: Thanks Rich. I think the easy route will be to bypass the fader, I'd like to figure out how to do that without cutting off the fader connector so that it can be restored to stock in the future. I'm not having much luck finding a DIY on the intertubes for which pins to jumper (or run new wires to) in order to route sound signal to the rear speakers. Aux input: yes, it looks like hacking into the cassette board will be the best option, if I can't figure out how to use the CD changer inputs. I'm not sure how to approach that yet, may need an o-scope to sample the signals. - Max Charleston SC On Fri, Jun 19, 2015 at 9:20 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: I think those fader swithces are just variable resistors/potentiometer things. put a meter on it and see what it does. Newer head units (I don't mean Beckers -- no idea what they have -- but any other thing you buy) have the fader built in so you can just bypass it and use the native function. Again, I don't know about Beckers but I was looking at the schematic for the radio in my truck, which I liberated from the 2000 Suburban when I put a new unit in there. I want to put an aux input for an ipod or a bluetooth module, and the way to do that is to tap into the cassette line. The unit itself has a remote cassette player that uses that line so just a matter of putting the wires and a mini-plug socket somewhere near the unit. Of course this is on my to-do list... Some people have found success by just opening up the unit and looking at the board or inputs and just tapping/splicing into the proper wire or trace or plug or something on the main board -- apparently most of them are annotated on the boards or it is easy enough to see what goes where. --R ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
The easiest of all will be finding the rear speaker wire connections, hopefully in the center console and accessible without too much trouble. If I can find those, then I can connect the radio directly to the speakers, bypassing the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 2:55 PM, Curt Raymond via Mercedes mercedes@okiebenz.com wrote: This is how every MB I've owned other than my '81 300TD with the factory Becker has worked. The '84 190D I ran the wires myself... -Curt ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
Actually now that you mention it I think it was the '78 240D I ran new wires on, on the '84 I think I spliced into the wires that were already there leaving it so it'd be easy to reconfigure to factory if somebody wanted to. -Curt From: Meade Dillon dillonm...@gmail.com To: Curt Raymond curtlud...@yahoo.com; Mercedes Discussion List mercedes@okiebenz.com Sent: Saturday, June 20, 2015 3:21 AM Subject: Re: [MBZ] Jaime I need help! '87 wagon radio replacement The easiest of all will be finding the rear speaker wire connections, hopefully in the center console and accessible without too much trouble. If I can find those, then I can connect the radio directly to the speakers, bypassing the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 2:55 PM, Curt Raymond via Mercedes mercedes@okiebenz.com wrote: This is how every MB I've owned other than my '81 300TD with the factory Becker has worked. The '84 190D I ran the wires myself... -Curt ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Jaime I need help! '87 wagon radio replacement
This is how every MB I've owned other than my '81 300TD with the factory Becker has worked. The '84 190D I ran the wires myself... -Curt From: Rich Thomas via Mercedes mercedes@okiebenz.com To: mercedes@okiebenz.com Cc: Rich Thomas richthomas79td...@constructivity.net Sent: Friday, June 19, 2015 11:03 PM Subject: Re: [MBZ] Jaime I need help! '87 wagon radio replacement Probably easier to just snake new wires back to the speakers and then connect directly to the head unit or the connector or whatever you can get to --R On 6/19/15 10:33 AM, Meade Dillon via Mercedes wrote: The issue is that the fader gets two-channel input (only two wires), and outputs four-channels (only four wires). The _ground_ or _negative_ signal to the speakers doesn't go through the fader, it goes from the radio through connector X48H and X48G, which are not listed in the FSM index of connector locations. I suspect they are somewhere under the center console. So I would need to run two more wires to that fader socket for either the front or the rear speakers, OR I could go directly to the front speakers from the radio (those connectors are readily available right behind the radio hole), and then jumper the fader input wires to the rear speaker signals. Unfortunately the electrical diagram from the FSM does not give pin numbers at the fader socket, so I guess that will be trial and error with a 9v battery. I'm concerned because I've read in several forum posts that modern radios don't like how Mercedes grounded the speakers in the 80's, now I need to see how the Becker 1492 installation compares to my 87 wagon, maybe in '94/'95 Mercedes continued with its speaker grounding method and the 1492 won't care. I'd like to put the Aux Input plug in the hole for the fader. - Max Charleston SC On Fri, Jun 19, 2015 at 9:44 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: You could just clip a jumper across the terminals for each side and turn the fader off -- that will create the easy path for the electrons to flow. Won't bugger the switch. --R On 6/19/15 9:26 AM, Meade Dillon via Mercedes wrote: Thanks Rich. I think the easy route will be to bypass the fader, I'd like to figure out how to do that without cutting off the fader connector so that it can be restored to stock in the future. I'm not having much luck finding a DIY on the intertubes for which pins to jumper (or run new wires to) in order to route sound signal to the rear speakers. Aux input: yes, it looks like hacking into the cassette board will be the best option, if I can't figure out how to use the CD changer inputs. I'm not sure how to approach that yet, may need an o-scope to sample the signals. - Max Charleston SC On Fri, Jun 19, 2015 at 9:20 AM, Rich Thomas via Mercedes mercedes@okiebenz.com wrote: I think those fader swithces are just variable resistors/potentiometer things. put a meter on it and see what it does. Newer head units (I don't mean Beckers -- no idea what they have -- but any other thing you buy) have the fader built in so you can just bypass it and use the native function. Again, I don't know about Beckers but I was looking at the schematic for the radio in my truck, which I liberated from the 2000 Suburban when I put a new unit in there. I want to put an aux input for an ipod or a bluetooth module, and the way to do that is to tap into the cassette line. The unit itself has a remote cassette player that uses that line so just a matter of putting the wires and a mini-plug socket somewhere near the unit. Of course this is on my to-do list... Some people have found success by just opening up the unit and looking at the board or inputs and just tapping/splicing into the proper wire or trace or plug or something on the main board -- apparently most of them are annotated on the boards or it is easy enough to see what goes where. --R ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
