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  #1  
Old 04-04-2013, 09:25 PM
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Location: West Michigan
Posts: 380
1991 300TE 4MATIC: What's this broken wire??

Hey there electrical gurus.
Can anyone identify this BROKEN wire? I've been having strange electrical issues lately and wonder if this could be part of the problem.




Issues:
1. No tach
2. no kickdown
3. ABS light on all of a sudden
(I thought all 3 were related to bad OVP...replaced with new MB OVP and no go.)
4. 4MATIC stopped working
5. rough idle
6. severe loss of fuel efficiency

All happened at the same time. The loss of #1,2,3 has been off and on. sometimes I could start the car again and all is well. Now no luck.

Any help appreciated.
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Current: '91 300TE 4MATIC 317k and climbing...
Former:
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'83 240D 216K 4spd manual "Da Bear" (aka best car ever)

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  #2  
Old 04-06-2013, 06:04 PM
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Anyone?
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Current: '91 300TE 4MATIC 317k and climbing...
Former:
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)

"Never sweat the petty things...
and never pet the sweaty things."
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  #3  
Old 04-06-2013, 06:16 PM
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Reconnect it. See what happens?
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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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  #4  
Old 04-06-2013, 07:03 PM
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Thumbs up

+ 1
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  #5  
Old 04-06-2013, 07:07 PM
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sounds like OVP symptoms, no?
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  #6  
Old 04-06-2013, 07:43 PM
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OP said they replaced OVP with a new one
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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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  #7  
Old 04-06-2013, 08:28 PM
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Quote:
Originally Posted by Aquaticedge View Post
OP said they replaced OVP with a new one
i missed that....darn adult ADD
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James 4:8

"...let us put aside the blindness of mind of those who can conceive of nothing higher than what is known through the senses"
-Saint Gregory Palamas, ---Discourse on the Holy Transfiguration of Our Lord God and Savior Jesus Christ


Centrally located in North East Central Pa.
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  #8  
Old 04-06-2013, 09:21 PM
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Was the ovp relay replaced with exact replacement? THERE NOT ALL THE SAME
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  #9  
Old 04-07-2013, 12:28 AM
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Uhhh... yeah reconnected it and didnt seem to be any different, however it has to be doing something or it wouldnt be there.

OVP is a MB new replacement. Same one as was there originally. (red top)
There is a relay next to the OVP... Anyone know what that is for? I searched the forums and couldnt get an answer.

I thought all those symptoms were related to OVP but new one didnt change anything. good thing it was a cheap part.

Here's some info I left out (forgot until after I posted)
1. Early on when the tach was sporadically going in and out, I took it to a local mech and he said it could be one of the round electronic connectors on the drvr side wheel well. At that time, I tapped it with a screwdriver and instantly got it working again. It would work for about a month at a time... then got worse. now nothing. so the AC compressor will not kick on, tach out, kickdown/passing gear not working, and ABS light always on.

So now I have no clue as to what could be causing all those problems all at once except the OVP but I replaced with NEW and still nothing.

** my biggest fear about this is that without the OVP working (if thats the case) then I could be harming the electronics which may be really bad. $$$.

Help!
__________________
Current: '91 300TE 4MATIC 317k and climbing...
Former:
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)

"Never sweat the petty things...
and never pet the sweaty things."
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  #10  
Old 04-07-2013, 01:21 AM
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What color is the wire under the cover. Where to the ends lead to?
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  #11  
Old 04-07-2013, 11:56 AM
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check the tach signal from ezl to round connector thing maybe corroded or loose connectiom, dont remember exactly maybe phillips screw holding wire connector
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  #12  
Old 04-07-2013, 01:23 PM
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Quote:
Originally Posted by Hogweed View Post
i missed that....darn adult ADD
true, I am afflicted with ADoS... Adult Deficit OHHH Shiney!
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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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  #13  
Old 04-07-2013, 01:25 PM
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I Dont know if this pertains to your Model, but some MBZ's had a Tach amplifier on the fender. they go funny no tach
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1987 300TD 311,000M Stolen. Presumed destroyed
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  #14  
Old 04-12-2013, 10:28 PM
Former Dieselholic
 
Join Date: Feb 2002
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Posts: 380
Quote:
Originally Posted by pwogaman View Post
What color is the wire under the cover. Where to the ends lead to?
The wire seems to be black. Where it leads...down along the firewall it seems to disappear... I cannot trace it underneath. Maybe goes thru firewall into cab. I''ll dig a little deeper Saturday. It seems to branch from the little tray of wires on top of the engine but I cannot get the cap off it without breaking it.

Quote:
Originally Posted by Aquaticedge View Post
I Dont know if this pertains to your Model, but some MBZ's had a Tach amplifier on the fender. they go funny no tach
I do believe I have that, that is if it a black plate-like deal with 3 round cap connectors about the size of a 50cent piece.

I'll take a look more Saturday. I'll actually have a couple hours that I can devote to it!! Thanks again guys for the assistance...and not just the obvious.
__________________
Current: '91 300TE 4MATIC 317k and climbing...
Former:
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)

"Never sweat the petty things...
and never pet the sweaty things."
Reply With Quote
  #15  
Old 04-12-2013, 10:47 PM
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Join Date: Oct 2004
Posts: 3,225
I don't have an OE harness on mine as I've got an aftermarket EFI but I *think* that wire goes down to a solenoid on the trans. This model should have an additional solenoid very similar to the kickdown solenoid with pipes that mount it near the bellhousing by the starter. I dont think it could hurt anything being broken so long as it doesnt short to ground while it is active.
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Turbo 103, T3/T04E 50 trim
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3" Exh, AEM W/B O2
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