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? asked in Cars & TransportationMaintenance & Repairs · 2 years ago

I have a 1989 Mercedes 300e. We just replaced the alternator twice and still it seems not to be charging correctly. Please help quick.?

Under no load it starts at 14v. When it warms 13.75v.

Under load of a/c and lights cold 12.75v warm 12.25v

There is a voltage drop of 0.2v from alternator to battery.

I had the battery tested and they (Advance Auto) said it was good.

1 Answer

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  • Dan
    Lv 5
    2 years ago

    Check the belt tension but it sounds like you have the wrong pulley on the alternator. A pulley with a smaller diameter would solve your problem.

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