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#1
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just bought 86 sdl, scary electrical problems help
My wife is a proud owner of a 1986 SDL with 167,000 miles. We bought it off a mechnic(good guy) where despite sitting for 3 years has no rust and is still aesthetically in very good shape.
Major issue - it was abandoned because the a/c melted down 3 years ago and fried the wires back to the fuse box, where the owner had been compensating with larger and larger fuses. That said the car runs. I've never turned on the a/c, the light for glow plug is always on, not to mention it eats batteries and the mechanic by-passed the starter with a switch under the dash. Do i need to replace the engine wiring harness?(expensive) Shoud i try to track down the bad wires which the mechanic tried and stopped. The car has other problems-holes in the muffler, noisy belt tensioner, nothing too bad though. and secretly i may like the car more than my perfect 84 300 td wagon it makes me feel like i'm cheating(on the car not my wife). |
#2
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Well, the AH mechanic that worked on my SDL prior to my ownership apparently had the same initial problem. My A/C drew too much power, so, they upped the fuse. End result, it blew the A/C relay. I'm glad I found the problem prior to blowing any more relays, or worse, but the bottom line is that the A/C clutch was pulling way too much power.
Get the wiring schematic, and first replace the fuses with the right size, one at a time. You might want to find a wrecked car to try to get the harness off of it. It certainly would be a much easier start.
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87 300SDL - 215K Miles !! 99 F-350CC Dually PSD - 190K 86 300SDL - 189K All on B-100 |
#3
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- The fuses have all been set to the original size. could the a/c still be draining the system despite not being engaged? Or have greater prolems been unleashed?
Thanks-James |
#4
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First, you need to see if you have any electrical drain with the ignition off. If so, then isolate it. If not, then check the draw with the ignition on and all accessories off.
Describe more about how it is 'eating' batteries. It sounds like the melted wiring has caused one or more shorts, and the realistic solution is just tracing them down
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87 300SDL - 215K Miles !! 99 F-350CC Dually PSD - 190K 86 300SDL - 189K All on B-100 |
#5
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The mechanic changed the battery and said he could not find a drain on it. After 3 days of starting and stoppng (no long drives) the new battery is dead.
The housing around the wiring harness is off. Viewing the wires i have isolated the a/c line and it is toast. The mechanic by-pasted the a/c wires and still electric abnormalities. I'll try to send pics in the morning. I also priced out a new wiring harness at $940 free shipping whoppee. Finding a wrecked 86 SDL may not be as easy. thank you -James |
#6
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Keep looking for a used harness. When my son's 351 Windsor caught fire (alternator) Ford wanted $1,000 for the engine compartment harness and another $400 for the injector harness. We got them both at the salvage yard for $150. I know the SDL is not as common as a Ford but someone will have it.
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Brian 87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017 02 F350 Powerstroke 180K 05 Chevy Express 1 ton w/Royal Utility box 120K 08 Infiniti FX-35 40K 15 Golf Sportwagen TDI 35K 10 Sprinter 3500 chassis with a Class A Winnebago on it. 56K |
#7
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new sld, problems cont.
Posted last night about my wiring harness and a/c, which seems to be toast.
I searched today (while at work) for a junked 1986 sdl. No luck so far. If anyone knows of a 126 sitting around with nothing to do, please let me know. I'm in Virginia and always looking for an excuse for a mercedes oriented road trip. Also has anyone switched out a engine wiring harness on a sdl? I helped a friend change his biodegratable wiring harness in a 94 e320. I think the 126 has many more connections. thanks -James |
#8
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I seriously doubt that an 86 SDL would have a MORE complicated wire harness than a 94 e320!
very little electronics compared to the 94 would be my guess.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#9
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l love this car
some pics - the engine sounds great, no rust, just unpredictable electrical problems.
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#10
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Oh, my! I see what you mean by scary electrical problems... I like my 82 more and more!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#11
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Just find a good, used harness. Not a big deal.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#13
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A/C Electrical Issues
When tracing or bypassing your electrical problems, don't forget that the supply for the A/C Compressor Clutch also feeds the Auxilliary Electric Water Pump for the heating system. Both are powered from Fuse #5. On my SDL I had to disconnect the Aux. Pump as even after replacing the fried A/C Clutch the fuse was still blowing. The Aux. pump was seized - a common problem - and was overloading the fuse circuit.
Definitely try to find a replacement wiring harness as otherwise you could be chasing gremlins for many moons to come!!
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1991 M-B 560SEL Arctic White/Grey 99,000 Miles 1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten) 2006 Volvo XC70 Blue/Beige 1999 Porsche Boxster Arena Red/Savanna Beige 1986 Porsche 928S Goldweiss/Brown |
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