What would be the most serious malfunction on a bad lower wiring harness? How much money are these going for these days?
Glen was kind enough to donate his old ones and I was going to tinker and maybe rebuild them, and put one on my car. The lower harness that is.
Steve, the most serious issue would be the large gauge wire that feeds the starter grounding to chassis but that is unlikely as it's covered in sheathing. The other wires are for oil pressure, oil level, and starter trigger so worse case would be not being able to start the car.
New lower harness is around $220 or so.
Putting the fun in dysfunction...
With new ones at ~$220, IMO it is absolutely not worth rebuilding this harness, unless your time is worth nothing and/or you have zero funds available. The cost of obtaining the correct size wires with the proper temp rating would not be cheap, and if you are thinking about raiding P+P, that's more time down the drain. Rebuilding would make sense after they go NLA, or when the price skyrockets...
I've experienced this- slammed second gear with harness wet- shorted out. Car stalled, restarted fine. Wire was completely disintegrated between alternator and contact point. I replaced alternator with a 143A just on principle and put a harness in. This car had a problematic a/c.. may have been unrelated but I replaced the base module to solve the problem."Steve, the most serious issue would be the large gauge wire that feeds the starter grounding to chassis but that is unlikely as it's covered in sheathing. The other wires are for oil pressure, oil level, and starter trigger so worse case would be not being able to start the car."
Anyone with me that upgraded harness were made at early as 1997, probably ETA's too?
I have my tin foil hat on, as in Tin Foil Hat Society, and I suspect that MB was avoiding a recall, so when cars cam in under warranty, they replaced the harness, with good upgraded harnesses.
I will take off the tin hat now . . .
Putting the fun in dysfunction...
Hello folks - firstly thanks for all the info on here. The bad news is that my wiring harness seems to be the original.
Anyone who has done this job - can you please advise any additional parts / clips / plastics that need to be ordered along with the harness? I will be tackling this job at home so would appreciate if anyone can help with the parts I need - appreciate quite a few of the plastics under a well used M119 are brittle from the heat so want to be as safe as possible when replacing everything.
Additionally, can anyone advise on a price for this harness in the states? Seen them online just under the $500 mark, will check with my local MB dealer in the UK and see how much the harness is in £.
You need to flip the tag over and look for the "F.D." date... see post #1.
Here is the label on the thick part of the wiring harness for the car for sale in Auburn MA (Lundgren Honda). Attached photo is a little hard to read - can anyone confirm ? ? It appears the F.O. date is June 2003 - but I'm not sure about that. Help ? ?
Looks like June 20,2003, so it should be good!
Be extra cognizant of rust up there in the NE.
Look at the usual spots. . .
Last edited by Trae; 05-02-2015 at 03:18 PM.
1992 500E Renntech
1990 560SEC/ 2001 SL500
1991 560SEC ECE/1995 E320 Cabriolet
So I checked my wiring harness after reading this thread and mine is made by Temic, Part number 124 440 2006 Z.D 11.03.92 F.D. 4.08.93. Car has been running fine all this time. Haven't found reference to this anywhere else on this forum, do I still need to worry about a potential future failure? Here is a photo of the label - came off when I tried to look at the dates (hope that's not a sign of the quality of the cable!):
Thanks for the reply - my initial thought was that since that was not the usual Delphi manufacturer, it might have different properties. I'll go check closer as per your pictures.
Hi All - Have been scouring this thread looking for sources for upper & lower wiring harnesses without luck. Either I get the404 error or there is no link.
Wanted to buy - Upper and lower wiring harnesses for my 1992 500E Euro version. New or used as long as they are in workable condition.
Part numbers are in the forum Wiki:
For USA residents here's a few online vendors:
Husker Auto Group:
Thanks so much for this email with vendor contacts!
All the best,
Hi, Doing checks on a potential purchase 500e, and the harness has no label like the ones shown above near the Ecu/behind the CAN box, the loom does however have a Mercedes part number on it, is there anywhere else that will show me when/if the loom was replaced? Thanks
I replaced my upper harness today with a new one - ZD manufactue date in 2012. The car "seemed to run fine" before the replacement .... but I did notice that the electric aux cooling fan was starting to oprate erratically (on all the time even from a cold start) and the AC system would seemingly stop conditioning the air ... only to go back to normal after cooling off for a while.
Looking at the old harness .... geez how fer cryin' out loud did the car even run???
1993 MB 500E
1996 Porsche 993 C2
Last edited by Stevester 500E; 09-25-2017 at 06:00 PM.
Yes there are permanent unfused live wires running to the injectors for example through M104 HFM and M119 LH engine wiring looms. (The ECU is negative switching) So there is a risk of fire for sure if they get very bad.
I find it amazing that-
A; Mercedes did not / were not made recall all cars with bad looms for replacement FOC
B; They charge 3x fortunes for the new looms and ETA's (even though they caused the problem!!)
C; The frequency of cars affected. Every Eco Junk era MB I have bought has came full of Eco Junk wiring in very bad condition. I've also yet to see any w124 in our scrap yards with a non Eco harness on it.
The vast majority of cars out there are still running around with Eco Junk. Indeed it can be the end for most of them too when people get quotes for repair (like my new to me Coupe which could have been scrapped just because of Eco Junk. Hasn't ran in 5 years) Also dont forget the rest of the entire car still has the bio-degradable wiring. At some point in time affected cars will have more issues potentially meaning very large wiring repairs throughout the car.
Last edited by JC220; 09-25-2017 at 11:50 PM.
1987 w124 200 - 3.6 AMG build | 1990 w124 300E-24 | 1992 w124 500E
1994 320CE Sportline | 1997 w140 S280 | 2007 w211 E220CDI
I tried to order 124-540-27-30 from MB Naperville and the order got cancelled as not available.
That is correct.I ordered one lower engine wiring harness for my 1992..and it got cancelled after putting up an order on MAKING one.The factory ONLY makes them on order..but they STILL did not make it.I waited for 2.5 months..to finally get the message back,that it will NOT be made.
BUT..i was indeed told i could try to put up another order in January.
I do remanufacture them though,as i did with my own harness.Turned out pretty good.Its not a difficult wiring harness to repair...though abit fiddly to get it right with the correct heat shielding,and lengths.
1992 w124 500e "Blackbeauty"
1989 w201 190e 2.5-16 Evo spec "Evoltwin"
2003 Ford Focus Rs (Sold )
Maybe MB is trying to find another supplier or manufacturer?
Just a guess...
Sent from my iPhone using Tapatalk Pro
this forum and others. The latest info I've had is that they are made in India and that the last batch was rejected for not being
up to standard,the next batch is supposed to be arriving Jan/Feb 2018 Good luck Dik Best