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#1
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Gauges and signal lights jumping and blinking during acceleration
My temp gauge and fuel gauge needles bounce all over the place as I accelerate and the rpms begin to rise - not really at lower rpms but at higher rpms. Also, the turn signal lights in my instrument cluster both light up at the same time as I accelerate. I assumed it was a bad ground and cleaned the ground with some sand paper but I don't think it really made a difference. I'm thinking now that maybe some of the solder joints on the gauges are bad. Any ideas?
Thanks, Scott
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Scott 1982 Mercedes 240D, 4 speed, 275,000 1988 Porsche 944 Turbo S (70,000) 1987 Porsche 911 Coupe 109,000 (sold) 1998 Mercedes E300 TurboDiesel 147,000 (sold) 1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!) 1997 Mercedes E300 Diesel 236,000 (sold) 1995 Ducati 900SS (sold) 1987 VW Jetta GLI 157,000 (sold) 1986 Camaro 125,000 (sold - P.O.S.) 1977 Corvette L82 125,000 (sold) 1965 Pontiac GTO 15,000 restored (sold) |
#2
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Which ground did you clean?
Don't forget the main ones: Batt-Chassis and Chassis-engine. Also, check for corrosion at the alternator terminal and apply a little silicone dielectric grease to the alternator connector.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#3
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Quote:
Scott
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Scott 1982 Mercedes 240D, 4 speed, 275,000 1988 Porsche 944 Turbo S (70,000) 1987 Porsche 911 Coupe 109,000 (sold) 1998 Mercedes E300 TurboDiesel 147,000 (sold) 1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!) 1997 Mercedes E300 Diesel 236,000 (sold) 1995 Ducati 900SS (sold) 1987 VW Jetta GLI 157,000 (sold) 1986 Camaro 125,000 (sold - P.O.S.) 1977 Corvette L82 125,000 (sold) 1965 Pontiac GTO 15,000 restored (sold) |
#4
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Think parallel circuit..........
Actually, the power source (alternator) grounding (eng-chassis strap) is even more critical.
(I've had the same problems myself and found the engine-chassis ground strap loose. This also resulted, eventually, in intermittent starting problems.)
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#5
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When you pull the instrument cluster you'll see the two grounding bolts. Another member suggested a temporary ground to the back of the cluster to verify the problem. You can also change out any dash bulbs light that may be out while your in there.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#6
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Instrument cluster troubles
Where can you attach a temporary ground to on the cluster itself???
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Looking for another Mercedes 300D or SD as a project vehicle.. |
#7
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Maybe under one of the Phillips screws that secure the gauges on the back of the cluster, like I said I haven't tried that but it might be able to be done with the cluster in the car. You can pull the light out of the GP indicator and maybe get an alligator clip on there. (the bulb holder grounds on the back of the cluster).
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#8
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I finally ran two new grounds from the back of the cluster. Solved my problem.
Scott
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Scott 1982 Mercedes 240D, 4 speed, 275,000 1988 Porsche 944 Turbo S (70,000) 1987 Porsche 911 Coupe 109,000 (sold) 1998 Mercedes E300 TurboDiesel 147,000 (sold) 1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!) 1997 Mercedes E300 Diesel 236,000 (sold) 1995 Ducati 900SS (sold) 1987 VW Jetta GLI 157,000 (sold) 1986 Camaro 125,000 (sold - P.O.S.) 1977 Corvette L82 125,000 (sold) 1965 Pontiac GTO 15,000 restored (sold) |
#9
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Thanks for the feed back, thats good too know.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
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