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Topic: R129 replacement Bio-degradable harness availability Reply to Thread
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  Topic Review (Newest First)
05-26-2019 03:26 PM
MadColonel67 Here is the latest. The old bio-D harness came out and as it turns out, the part #1295400530 required very minor alteration to fit. It went back in with a total of 4.5 hours r/reinstall. So, if you have a VIN
that says your harness is not available anymore, keep looking at harnesses until you find a close match.
05-14-2019 06:15 PM
Ozzie Rob Actually just googled the part # for the oil harness, and that is not the one I require. It is the one where it starts at the ECU and not the one for the injection. Also, does anyone know what that magnetic switch is for the soft top that is located above the front windscreen is called, or a part#. Thanks, Rob
05-14-2019 05:56 PM
Ozzie Rob The oil pressure harness is what I require. Does anyone have it? 1995 sl500 R129. I need it urgent as I have to sell the car to support my 2 grand son's 4 and 6 year olds. Thanks Rob
05-14-2019 12:07 PM
MadColonel67
Quote:
Originally Posted by roadhouse View Post
In 10 hours you would be able to MAKE a new harness AND replace it. The lower harness is only 5 or 6 wires, out of which the heavy battery cable usually doesn't even need replacing. (It came with non degrading insulation)
It consists of oil pressure wire, low oil level wire, alternator exciter wire, charge on alternator, starter and starter coil wires.
Of the three degrading harnesses, this is the easiest to replicate.
This is what I learned - My VIN for the '94 SL500 used harness #1295402230. Only 2800 units used that harness and I am told, the reason why it is no longer supported. There were earlier harnesses and later harnesses for the SL500 - #1295402630 (available in Germany) and #1295400530 (available stateside). The diagrams for all 3 look similar if not the same. It could be a connector that is different or some other minor adjustment. So, I ordered the stateside harness and my mechanic will remove the old harness and see what has to be modified and then reinstall. I am told the remove and reinstall should be 4 to 6 hours labor.

I hope this helps fellow bio-degradable owners of SL500s.
05-14-2019 04:19 AM
roadhouse In 10 hours you would be able to MAKE a new harness AND replace it. The lower harness is only 5 or 6 wires, out of which the heavy battery cable usually doesn't even need replacing. (It came with non degrading insulation)
It consists of oil pressure wire, low oil level wire, alternator exciter wire, charge on alternator, starter and starter coil wires.
Of the three degrading harnesses, this is the easiest to replicate.
05-13-2019 04:47 PM
duh_vinci
Quote:
Originally Posted by MadColonel67 View Post
Thanks for the information. If it is NLA, how can it be repaired/replaced so inexpensively? Where does the new harness come from? I was told up to 10 hours to replace it IF there was a new harness available.
If we are indeed talking about the lower harness (starter, oil etc), there is no way in hell it's 10 hours. I should have repaired mine when I had transmission out on SL500, but I was too concentrated on rebuilding that automatic box...

This would shine some light

https://www.benzworld.org/forums/r12...placement.html

To my best knowledge, there are 3 main harnesses that are affected (depending on the model of R129): Main upper, throttle body, lower starter harness. Few other pieces are (depending on the model again): MAF and electric cooling fans. Other affected pieces (usually, even later models) are headlight wires.

Hope this helps.

Regards,
D
05-13-2019 02:11 PM
MadColonel67
Quote:
Originally Posted by duh_vinci View Post
#22 on the diagram below

Mercedes-Benz Teilekatalog (Ersatzteile online)

Lower harness (starter, oil pressure and such) Definitely NLA, for a quality shop, its about $200-$300 to do it right.


Regards,
D
Thanks for the information. If it is NLA, how can it be repaired/replaced so inexpensively? Where does the new harness come from? I was told up to 10 hours to replace it IF there was a new harness available.
05-13-2019 02:00 PM
duh_vinci #22 on the diagram below

Mercedes-Benz Teilekatalog (Ersatzteile online)

Lower harness (starter, oil pressure and such) Definitely NLA, for a quality shop, its about $200-$300 to do it right.


Regards,
D
05-13-2019 01:58 PM
duh_vinci #22 on the diagram below

Mercedes-Benz Teilekatalog (Ersatzteile online)

Lower harness (starter, oil pressure and such) Definitely NLA, for a quality shop, its about $200-$300 to do it right.


Regards,
D
05-13-2019 01:54 PM
MadColonel67
Quote:
Originally Posted by roadhouse View Post
What number is that for? Upper, lower or MAF harness? Which one do you need?
I am told it is the big one that runs underneath the car. The part number was verified by the Mercedes dealer.
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