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There are too many variables here to give a direct answer, but i would start by making sure the battery is not bad. After that you would use a volt meter to see if the Alternator is supplying 14V or more. If it is not then you need to find out why which is where things get involved.

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Q: My 1987 560 SL had a dead battery after a month of not being driven The cables were misapplied to the terminal It won't hold a charge now What did I do..Blown fuse...Short the voltage regulator?
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