1990 SL500 engine harness,Engine module - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 07-12-2014, 12:37 PM Thread Starter
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Date registered: Apr 2014
Vehicle: 1990 SL500
Location: USA
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1990 SL500 engine harness,Engine module

Hello All, I just acquired a 90 SL500 sport R129. Sent it to a dealer in order to have it checked out. I thought I just needed a general tune up as the car did not have that much power(I added fresh gas/cleaner). The car had been sitting idle underground for a couple of years. What was conveyed to me is that lack of power is due to Engine harness wires bad, bad engine Module and Knock sensor. The module replacemnt as well as the knock sensor can be located at a nice sum. They are having issues locating the engine harness (129-540-1805). My question to the experts is it important to replace all of these at one time? I am wondering if the dealer is taking a shotgun appraoch i.e., just saying lets replace it all and be done. They did say at first the wires were brittle and need the harness then they came back with these aditonal problems. If I had to deduce what was happening would it make sense to change the engine module first, then knock sensor finally the harness if needed? Also they said the AC won't turn off due to this problem as well. Is there a good source someone can suggest to obtain a rebuilt/new engine harness as I will have obtain that on my own. Any and all input/assistance will be greatly appreciated Thank you all
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post #2 of 2 (permalink) Old 07-12-2014, 11:57 PM
Date registered: Jul 2005
Vehicle: 90 300E, 99 ML430, 00 ML320, 05 E500 4matic Wagon
Location: WI
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The harness is indeed no longer available from MB.
Found this one. If you know the other part#s I would certainly consider used parts to cut cost.
90 92 Mercedes Benz R129 500 SL Complete Uncut Injector Harness 1295401805 | eBay
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