1994 E320 Wiring Harness Symptoms - Mercedes-Benz Forum

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post #1 of 22 (permalink) Old 04-20-2011, 08:10 PM Thread Starter
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1994 E320 Wiring Harness Symptoms

Hey Guys,

I have found this forum to be very useful and as such I wanted to contribute a little based on my experience.

On my 94 E320 109kmiles, i had a rough idle that wouldnt go away and the car would sometimes bog down under power. I had a hint that the harness was bad but thought it wasnt so bad close to the engine.... Turns out i was WRONG! Eventually the car wouldn't start and then I towed it back to "Uncle Benz Hospital" better know as my garage then i proceedes to test for spark and then realized that 2 out of 3 ignition coils were not firing...so with a blade tore of the outer insulation of the coil connectors and bam! crumbs like bread- insulation of the harness. what i had seen elsewhere on the engine wiring harness was true.

Moral of the story:

When it comes to Mercedes-Benz, cutting corners is absolutely futile... If you see its bad change it! As an aspiring Benz tech, I was happy to discover that the harness could crumble to the point where the car wouldn't start anymore. I wish everyone on theW124 FORUM the best in diagnosis!!
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post #2 of 22 (permalink) Old 04-20-2011, 09:49 PM
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Don't forget the ETA (electronic throttle actuator). It suffers from the same wiring symptoms and will cause electrical nightmares until it's been replaced. These later W124s are almost impossible to diagnose electrically until the harness & ETA have been replaced.

The ETA is VIN specific, depending if your has ASR or not.
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post #3 of 22 (permalink) Old 07-02-2011, 10:29 PM
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What is the most prominant place for the harness to fail? Can this section be repaired and wires re taped or enclosed in a wire loom? What information would be needed to ensure compatibility?

Thanks for any information
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post #4 of 22 (permalink) Old 07-02-2011, 10:56 PM
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Once it goes bad you would have to re wrap all the wires. They all cooked at the same rate. They will degrade from firewal to ungine, and there is a lower harness but its less of an issue due to less wires.

When I first waited to get mine i bought a sppool of wire and soldered it all together 1 wire at a time and did it in about 4 hours.

Worked great for the 2 weeks I used it.

If you see any issues on any of the wires you might as well take it out and do them all. It will be just a matter of time.
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post #5 of 22 (permalink) Old 09-23-2015, 04:53 PM
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So I am looking to buy a 1994 E320. Is there trick to determining if the wire harness is defective? Other than visually looking? Is there an ideal part of the harness to inspect?
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post #6 of 22 (permalink) Old 09-23-2015, 05:13 PM
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Originally Posted by MediaGiant View Post
So I am looking to buy a 1994 E320. Is there trick to determining if the wire harness is defective? Other than visually looking? Is there an ideal part of the harness to inspect?
Look behind the battery backsplash. On the driver's side of the connector plug area, look for a white tag attached to a large wire bundle with the name "Delphi" on it. No tag = original eco-junk harness. Take pictures to post if you are not sure.

This is not the best picture, but you can see it just above the corner of the battery:


Can also make it out here, too:




I have several wiring harnesses (E300/320 and E400/420), ETA's, side/tail/headlights and trim for sale. I can also get requested parts from local JYs. PM me.

Last edited by NobleTruths; 09-23-2015 at 05:15 PM.
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post #7 of 22 (permalink) Old 09-23-2015, 05:22 PM
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Thanks for the response, very helpful. So battery is on the passenger side, correct?

If it is the original, what would harness cost? are there used available?
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post #8 of 22 (permalink) Old 09-23-2015, 05:30 PM
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Originally Posted by MediaGiant View Post
Thanks for the response, very helpful. So battery is on the passenger side, correct?

If it is the original, what would harness cost? are there used available?
Passenger side for LHD. As you can see in my signature, I sell many used, but good, components. A brand new one would cost about $1100. I am much more reasonable.


I have several wiring harnesses (E300/320 and E400/420), ETA's, side/tail/headlights and trim for sale. I can also get requested parts from local JYs. PM me.
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post #9 of 22 (permalink) Old 09-23-2015, 05:44 PM
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Originally Posted by MediaGiant View Post
Thanks for the response, very helpful. So battery is on the passenger side, correct?

If it is the original, what would harness cost? are there used available?
Mercedes engine wiring harness 1244402933 124 440 2933 29 33 updated e320 cable | eBay
Parts number:
for 1994 E320 124 440 5632
for 1995 E320 124 440 2993
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post #10 of 22 (permalink) Old 09-23-2015, 05:48 PM
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Originally Posted by pbuchmueller66 View Post
Parts number:
for 1994 E320 124 440 5632
for 1995 E320 124 440 2993
2933


I have several wiring harnesses (E300/320 and E400/420), ETA's, side/tail/headlights and trim for sale. I can also get requested parts from local JYs. PM me.
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