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Old 11-07-2018, 10:12 PM
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Join Date: Aug 2012
Posts: 35
Reversed polarity

Hi, I did something really stupid and by mistake reversed polarity when installing new battery on 87 300td.....got a big spark for a moment when wrong terminals touched....


After that incident I lost completely any tachometer reading and ABS light is now on (was not before).
I checked all the fuses but could not find any burned and also not the one that would be related to the instruments.


Would maybe someone know where I should start to troubleshoot this; what would be the first most likely thing that would burn from reversed polarity and make Tacho and ABS stop working?


Thanks a lot, Robert
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