Jump Start Gone Bad......... - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-05-2009, 11:35 PM Thread Starter
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Jump Start Gone Bad.........

I jump started my 92 500 R129. I connected the terminals WRONG (pos to neg). The battery on the other car started to smoke. I discconected the cables. I jump started my R129 the propper way, and my instrument cluster was not working. I replaced the fuse and everything works except the MPG guage.

Now the car is hard to start, idles very rough, sometimes turns off. I can drive it, but it feels like its driving on 4 cylinders NO POWER. Missfiers bad.

Please any info will help. I have replaced the battery but still the same problem.
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post #2 of 3 (permalink) Old 11-06-2009, 01:33 AM
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first of all, welcome.!
second, next time you jump start a car, put the negative cable of the car that needs jumped on a part of the engine or something that is grounded to the battery. do not put the negative directly to the terminal. doing so could possibly save $$$ and time by protecting your electrical components from frying .... or something along those lines. i just know that its safer.
third, what probably happened was what i said above. it could be a problem with a relay, sensor or computer... you might want to do a search on the over voltage protection (ovp) relay. im not sure... but if you do a search im sure someones done or had the same kind of problem.
best of luck !!!

Gamble says... does it really matter.?.?.?
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post #3 of 3 (permalink) Old 11-06-2009, 10:55 PM
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