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#1
10-13-2004, 08:31 AM
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Temp/Tank gauge ground location
Okay, I have a 1984 300SD. Ever since I have owned it (5 years) the coolant temperature and fuel gauges have registered erratically. Usually a good thump on the top of the dash will get them to calm down however I'm getting strange looks from people when I do it. I've asked several times how to fix the problem and everybody says, "oh it's the ground connection. Just clean it, tighten it and it'll fix it up". The only problem I have is that no tells me where the blasted thing is!
 Could some kind person out there help a poor school teacher avoid getting arrested for abusing my beautiful car? 
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Old age and treachery will allways overcome youth and skill!  1993 S500 1984 380SL 
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#2
10-13-2004, 12:24 PM
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my tach and oil pressure gauges stopped working (and my clock stopped keeping correct time) after I removed the console once. someone on the board told me to run a ground wire from the metal housing at the back of the gauges (he said to solder it on, but I just put it under a screw with an eye terminal) to a ground point in the dash area behind the console (I used a screw back there). It worked like a charm. disconnect the battery before you run the ground wire.
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2005 Mercedes C230k sport sedan, 6 speed 1987 Porsche 924S - 968-engined track car
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#3
10-13-2004, 03:49 PM
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Fuel/Temp gauge
For a 380SL, this ground is behind the instrument cluster. You need to remove the steering wheel on that car (not on all Mercedes though) to get at the instrument cluster. If you get the electrical documentation from Mercedes for the car, they show where the ground is. I also had the exact problem you described-- fuel and temp gauge. On the cluster, these are within the same physical unit. I had thought the unit went bad but it turned-out that there was a bad ground for the instrument cluster and regrounded it. As I recall, it was referred to as G102 in the 107 body series documentation (SL, I know not your car). Regrounding it solved the problem completely and also fixed several other issues I didn't even know I had, such as a seat belt buzzer that goes-on if I'm in the seat and not belted-- a feature that started working after this fix but I could never recall over the past 10 years if I ever even had the feature in the first place...now I do
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