Question about 1999 Mercedes-Benz M-Class

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Dead battery. Alternator is charging, but the juice is not getting to battery. 1998 Slk 230. There is a relay p/n 002 542 20 19 05 3905 00, by the battery, (G) from the alternator has 19.8 volts, battery side has 12 volts. Is this relay bad or is something else causing this? Replaced alternator, same condition. Help! Thanks !!

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  • Anonymous Mar 18, 2014

    new battery becomes unserviceable

  • Anonymous Mar 25, 2014

    i changed alternator and regulater and i check the volts at the alternator and still at 12 volts



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Check the fuse box, fuse #19 -

Posted on Aug 17, 2009

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19.8 volts is too high. the alt regulator is not working. The regulator needs a battery source feed to work. Both the feed for the regulator and the connection between the output post and the positive battery terminal should go through an ALT fuse. Start by checking that.

Posted on Mar 01, 2009


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