How to replace the engine wiring harness on a 1994 Mercedes E320 with the M104 engine and W124 chassis. Harness part number is 124 440 5632.
1994 Mercedes E320 Engine Wiring Harness Replacement (W124 chassis, M104 engine)
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Great videos!!! I’m working on my 1994 Mercedes Benz E320 as well, so these videos are proving to be very helpful. 🙂 Also, do you know what would be broken if my heater and defroster aren’t working? I’ve replaced the blower motor, relay, and the climate control unit and my heat still isn’t coming on. Is it possible that it’s the blower motor regulator or blower resistor? If you have any ideas that would be great. Thanks!
I am just catching up to the questions, so I apologise for the delay. I would think that there is an electrical test to check out the sending unit. I mean using a voltmeter to measure the output voltage out of the sensor(s). It looks like it might be a connection issue on the back of the instrument cluster or the gauge itself might have gone bad. Good luck.
There is supposed to be a white tag around the harness with the manufacturing date info. It should be located near the inside side of the battery. On my original harness it was missing!!! The newer harnesses have them. Good luck
Hey thanks for posting this. I just changed my 1994 e320’s Engine Wiring Harness with the Brand New for $1100. :/ But it runs like a champ now. Couldn’t really have done the job without this video, thanks again.
Did you try to change the oil pressure guage (the sender unit mounted on the oil filter housing)? I had the same problem on the same car, and the problem on my car was a defect sender unit.
Is there a way to tell if the wire harness is replaced? Is there a code or date on the wire?
Thanks
hello i like the detail that you used in video attention to detail super job, i have question if you can help, my 94 e320 stop registering oil pressure on the gauge inside took valve cap off while running oil shooting everywhere but no oil pressure on gauge replaced sender from oil engine that was working no pressure still what do you think.
I suspect that it would be nearly identical. Just start at the big connector and do one connection at a time.
Would this be the same steps if I were to replace my 1995 c280?
Ive watched a few of your videos very informative. Good job.
Man you do not no how much you really helped me, I have a 1994 E420 with a very similar layout and it will not start, and the harness is degrading, but I’m ordering one as of thursday I miss my car.
In the past couple of years, I had the Check Engine light come on a few times. The mechanic troubleshot the components associated with the DTCs and could not find anything wrong. He suggested replacement of the harness. After reading the forums, many folks reported if the harness is giving problems to replace it, as it may fry the ECU. Glad that I did, as my harness had many wires with the insulation completely gone, and connectors that disintegrated when I grabbed them.
What symptoms were you having with your car that made you think of replacing the harness?
Very usefull Stuff!
Many thanks you,for video.Hope will else