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.

__________________
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."

Anyone?

__________________
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."

Reconnect it. See what happens?

__________________
hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

+ 1

sounds like OVP symptoms, no?

__________________
0o==o0

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.

OP said they replaced OVP with a new one

__________________
hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

i missed that....darn adult ADD

__________________
0o==o0

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.

What color is the wire under the cover. Where to the ends lead to?

__________________
http://i284.photobucket.com/albums/l...aman/Fleet.jpg

Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

check the tach signal from ezl to round connector thing maybe corroded or loose connectiom, dont remember exactly maybe phillips screw holding wire connector

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

__________________
hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

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.

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."

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.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Thanks guys!
Well I checked ground connections, all seem nice and tight.
Put new end connectors on the mystery wire and nothing (noticeably) happened.

Decided that it couldn't hurt to check the brushes on the voltage regulator.
Took it out and they were less than an 1/8" exposed!
Put in a new voltage regulator and now not only does the tach work properly, the jumpy fuel gauge is now working properly, headlights are brighter, dash lights are brighter and starts up MUCH easier than before.

I don't want to be overly optimistic but before whenever I started it up, it would kinda clack a few seconds until the oil got to full pressure. Now it doesnt do that at all. Just purrs. Strange, and I'll watch that one, but seems the voltage regulator may have cured a ton of strange little symptoms.

I know that voltage regulators fix some goofy things...but it's been a few days now since replacing it and seems to have breathed new life into my 317k baby.

__________________
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."