BenzWorld Junior Member
Date registered: Feb 2012
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Alternator charging problem 1978 280E
So I am helping my friend with her car and the battery has been recharged. The alternator replaced by a rebuild one week ago. It is still not charging. I get 13V at the battery turned off. I get 12.8 Volts when the car is running both at the battery terminals and the big red wires off the alternator. When the car has "key on" I see 1.6 V at the small blue wire on the alternator and 2.9 volts when it is running. Shouldn't this be a much higher voltage like 12 Volts? Does it have internal or external voltage regulator? Flying blind here with no manual.