How is the OVP mounted. Does it simply plug into a fixed base receptacle,
or what?
Wilton
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How is the OVP mounted. Does it simply plug into a fixed base
receptacle,
or what?
In my 126, yes. Right next to the Klima, near the fuse box.
-- Jim
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Ordered OVP from Rusty yesterday afternoon; at my front door late this
morning. Thanks.
Wife out somewhere with the car. 'Hope both are ok.
Wilton
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on edge of the plug with flat screwdriver got
it started.
Wilton
- Original Message -
From: Jim Cathey [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Thursday, June 19, 2008 10:03 AM
Subject: Re: [MBZ] 91 350SDL tac
How is the OVP mounted. Does it simply plug
Could this be why my SDL likes to shudder when I drop the car to idle from a
higher RPM? The RPM will drop below 500 and rise back up to the set 700 rpm.
I've tried adjusting the RPM control behind the fusebox, and it doesn't change.
Luther
On Tue, 17 Jun 2008 21:04:36 -0500, dave walton
You guys were right, of course, on location of the OVP. 'Sitting right up
there just inboard of the brake booster. 'Ordered one from Rusty this
morning. I may do an autopsy on the old one. Thanks, again.
Wilton
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'Drove the 126 coupla miles this morning. Tac went to 0 for minute or so
again; all other instruments remained normal. So is this an overvolt relay
prob? BTW, what does overvolt relay do? 'Sounds like it's supposed to
protect some system from an overvolt situation. So is there a prob with the
The tachometer signal goes through the overvoltage relay - at least it
does on my 87SDL. That is the limit of my knowledge. I'm hoping others
will chime in to paint the bigger picture and fill in the details. I
am curious why the overvoltage relay needs a tach signal and what it
does with it.
BTW, what does overvolt relay do? 'Sounds like it's supposed to
protect some system from an overvolt situation.
Exactly. As power to many of the more electronically-filled items
goes _through_ the OVP relay, and as the OVP gets flakey inside, you
can have problems with any/all of these
So the prob IS the OVP, then, right?
Wilton
- Original Message -
From: Jim Cathey [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Tuesday, June 17, 2008 9:19 PM
Subject: Re: [MBZ] 91 350SDL tac
BTW, what does overvolt relay do? 'Sounds like it's supposed
think I told you that several days ago
Wilton Strickland wrote:
So the prob IS the OVP, then, right?
Wilton
- Original Message -
From: Jim Cathey [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Tuesday, June 17, 2008 9:19 PM
Subject: Re: [MBZ] 91
The tachometer signal goes through the overvoltage relay - at least it
does on my 87SDL. That is the limit of my knowledge. I'm hoping others
will chime in to paint the bigger picture and fill in the details. I
am curious why the overvoltage relay needs a tach signal and what it
does with it.
So the prob IS the OVP, then, right?
Maybe. It's certainly a prime suspect, if other things
(such as ABS and the airbag system) are also acting up.
-- Jim
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PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Tuesday, June 17, 2008 9:25 PM
Subject: Re: [MBZ] 91 350SDL tac
think I told you that several days ago
Wilton Strickland wrote:
So the prob IS the OVP, then, right?
Wilton
- Original Message -
From: Jim Cathey
Kaleb, I just noticed I spelled your name with an i. 'Sorry.
Wilton
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If it helps - when my overvoltage relay was acting up the tach went to
zero and the ABS light came on. Other than that things were normal.
-Dave Walton
On Tue, Jun 17, 2008 at 9:27 PM, Jim Cathey [EMAIL PROTECTED] wrote:
The tachometer signal goes through the overvoltage relay - at least it
Oh - one more thing.. The idle speed changed when it kicked in or out.
Don't recall which was a higher rpm. If you were stopped at a light
with the brake on when it changed, you could feel the car hunkering
down or releasing a bit as the engine put more or less umph to the
transmission.
HTH
Oh - one more thing.. The idle speed changed when it kicked in or out.
Don't recall which was a higher rpm.
It would have gone higher during the malfunction. The car's set
to idle very high as a fail-safe, and the idle control system
(powered through the OVP) drags it down to where it should
That's exactly what it does -- it conditions the current for the
engine controls and the tach signal is from the crank position
sensor, so if it's intermittant, the usual failure mode, the tach
signal will vanish as the electronics switch off. Your idle will go
to the mechanical stop at
, 2008 10:32 PM
Subject: Re: [MBZ] 91 350SDL tac
That's exactly what it does -- it conditions the current for the
engine controls and the tach signal is from the crank position
sensor, so if it's intermittant, the usual failure mode, the tach
signal will vanish as the electronics switch off. Your
I recently had a problem on an 87SDL where the Tachometer worked
intermittently for several weeks, then failed completely. Resistance
across pins 12 on the Klima (Kilma) relay socket was ~ 9k ohms - so
the wires to the engine speed sensor were probably okay. Swapping the
overvoltage relay fixed
'Bout an hour ago while at about 30 mph in the 350SDL, a needle flicker on
the instrument panel suddenly cought my eye. The tac had gone to 0! Air
speed was stilI good at 30; engine response good - still plenty of power,
but tac was at 0. After coupla minutes, tac suddenly jumped back up to
Wilton Strickland wrote:
Tips?
Drive it 'til the 300D is mobile again.
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Hi Wilton,
When was the last fuse replacement? Memory might be wrong, but I
recall that was the cause for tach failure on my 300SD...
Take care,
Chuck
To remember Marshall.. Change ALL fuses out every 10 years!
On Jun 13, 2008, at 8:07 AM, Wilton Strickland wrote:
'Bout an hour ago
My first thought.
Wilton
- Original Message -
From: Mitch Haley [EMAIL PROTECTED]
To: Mercedes Discussion List mercedes@okiebenz.com
Sent: Friday, June 13, 2008 11:14 AM
Subject: Re: [MBZ] 91 350SDL tac
Wilton Strickland wrote:
Tips?
Drive it 'til the 300D is mobile again
Replace the instrument fuse (especially if your oil pressure dropped
to zero at the same time) and the OVP relay.
Peter
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overvoltage relay
Wilton Strickland wrote:
'Bout an hour ago while at about 30 mph in the 350SDL, a needle flicker on
the instrument panel suddenly cought my eye. The tac had gone to 0! Air
speed was stilI good at 30; engine response good - still plenty of power,
but tac was at 0. After
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