Speakers were not grounded from the factory. Beware if this is the case.
Jaime
On Saturday, June 20, 2015, fmiser via Mercedes
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
> 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
> 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 impedan
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,
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 n
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
The easiest of all will be finding the
edes Discussion List
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 fin
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
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
To: mercedes@okiebenz.com
Cc: Rich Thomas
Sent: Friday, June 19, 2015 11:03 PM
Subject: Re: [MBZ] Ja
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
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
connect
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
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
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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)
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" funct
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
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 somethin
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 1
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