Question about 1996 Mercedes-Benz C-Class

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Not holding charge but battery is new and altenator is fine . could it be a ground? Also heater fan and radio not working

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Not a ground. Short is likely.

Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 07, 2010

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What did the 'new' engine come out of?
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This is what I would do... remove the battery cable from the battery after you shut of everything in the car... lights blower fan et al... and see if you are getting an arc when you reattach it. That will give you a clue to whether a dead short is involved (if it arcs strong ) .
if you only get a spark it is normal , as there are draws that you can't dislocate w/o removing fuses.
If you dont get the dead short arc , then put a lead on the - NEG. post and ground the neg. to the engine dirrectly from the battery to any bolt on the engine bigger than 10mm. ( a bracket or the instilation hooks on the eng. should give you a reliable ground. if that causes an arc while the car is running my first thought is correct.
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It is my assumption that your battery starts the car , then the sole source of electric is being drawn from the altenater .
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