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Thread: HOW-TO: Determining the age of your engine wiring harness

  1. #61
    Clark Vader clarkz71's Avatar
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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by gerryvz View Post
    That Delphi plant in Linhó, Portugal, has been closed since 2006.

    I wonder where they are making the harnesses now?
    My new Delphi harness is marked made in Portugal, 06-22-2012 build date.
    Last edited by clarkz71; 08-15-2014 at 07:04 PM.

  2. #62

    Re: How to determine the age of your engine wiring harness

    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.

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    Re: How to determine the age of your engine wiring harness

    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.
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  4. #64
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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by Glen View Post
    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.
    The two worst problems I have seen, only once each were: permanent engagement burning up a starter, and the starter solenoid wiring burned up some distance into the vehicle harness. I strongly suspect that enhanced idiocy on the part of the owners, drivers, and / or servicing personnel played a part in each of these instances as well, but they still should serve as a warning...
    Putting the fun in dysfunction...

  5. #65
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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by Glen View Post
    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.
    Oops, the large wire goes to the alternator, not starter.

  6. #66
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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by Glen View Post
    Oops, the large wire goes to the alternator, not starter.
    Actually it is both. It goes to the starter first, then continues to the alternator.

    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...

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    Re: How to determine the age of your engine wiring harness

    "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."
    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.

    Michael

  8. #68
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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by gsxr View Post
    Actually it is both. It goes to the starter first, then continues to the alternator.

    Correct, have done many, and I don't look forward to the next..........

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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by clarkz71 View Post
    Correct, have done many, and I don't look forward to the next..........
    It is a MUCH easier job on the M104 in the W124.....that is for sure......and quite an easy job on the W126/M117 as well.

  10. #70

    Re: How to determine the age of your engine wiring harness

    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 . . .

  11. #71
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    Re: How to determine the age of your engine wiring harness

    Quote Originally Posted by Stevester 500E View Post
    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 . . .
    I would have perfect confidence in any harness or actuator dated '97. No, leave it on! Here, to go with your outfit: https://www.youtube.com/watch?v=wjIM1Z4Q6Lo
    Putting the fun in dysfunction...

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    Re: How to determine the age of your engine wiring harness

    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 £.

    Cheers,

    Bill

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    Re: HOW-TO: Determining the age of your engine wiring harness

    You need to flip the tag over and look for the "F.D." date... see post #1.


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    Re: How to determine the age of your engine wiring harness




    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 ? ?
    Attached Images Attached Images

  15. #75
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    Re: HOW-TO: Determining the age of your engine wiring harness

    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.
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    Re: HOW-TO: Determining the age of your engine wiring harness

    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!):

    IMG_1935.jpgIMG_1936.jpg

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    Re: HOW-TO: Determining the age of your engine wiring harness

    Quote Originally Posted by Davide View Post
    ... 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!):
    Yes, you are on borrowed time... look at the insulation on the wires.

    Attached Images Attached Images

  18. #78
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    Re: HOW-TO: Determining the age of your engine wiring harness

    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.

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    Re: HOW-TO: Determining the age of your engine wiring harness

    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.

    Many thanks!


    Joe

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    Re: HOW-TO: Determining the age of your engine wiring harness

    Quote Originally Posted by JCM1 View Post
    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.
    Joe, most US vendors won't ship to Canada. However, the MB Classic Center will ship internationally, ping Tom Hanson and he can get what you need. Might get a bit of a discount if you mention the forum (wouldn't hurt to try)...

    Part numbers are in the forum Wiki:
    http://www.500eboard.com/forums/wiki...Wiring-Harness
    http://www.500eboard.com/forums/wiki...Wiring-Harness

    For USA residents here's a few online vendors:

    MB Atlanta:
    http://www.mbpartsworld.com/p/__/CAB...245439526.html

    MB Naperville:
    http://www.mboemparts.com/oe-mercedes-benz/1245439526

    Husker Auto Group:
    http://www.mbdirectparts.com/oe-merc...enz/1245439526

    World MB:
    http://www.worldoemparts.com/worldto...enz/1245439526



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    Re: HOW-TO: Determining the age of your engine wiring harness

    Thanks so much for this email with vendor contacts!

    All the best,


    Joe

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    Re: HOW-TO: Determining the age of your engine wiring harness

    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

  23. #83
    Senior Member Jlaa's Avatar
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    Re: HOW-TO: Determining the age of your engine wiring harness

    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???
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  25. #84

    Re: HOW-TO: Determining the age of your engine wiring harness

    I met someone over the weekend whose upper engine harness in an M104 had "fried".
    I do believe that it is possible to have a fire started in the engine compartment with a bad harness, even in the absence of gasoline.


    Quote Originally Posted by Jlaa View Post
    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???
    Last edited by Stevester 500E; 3 Weeks Ago at 06:00 PM.

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  27. #85
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    Re: HOW-TO: Determining the age of your engine wiring harness

    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; 3 Weeks Ago at 11:50 PM.
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  29. #86
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    Re: HOW-TO: Determining the age of your engine wiring harness

    I tried to order 124-540-27-30 from MB Naperville and the order got cancelled as not available.

  30. #87
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    Re: HOW-TO: Determining the age of your engine wiring harness

    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.
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  31. #88
    Senior Member Eno's Avatar
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    Re: HOW-TO: Determining the age of your engine wiring harness

    Maybe MB is trying to find another supplier or manufacturer?
    Just a guess...


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