i having problems with my alternator shorting out. Any suggestions on why my alternator is shorting out. In two weeks i have gone thru 2 batteries and three alternators.

Where are you getting these alternators and are they Bosch or aftermarket?

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1989 300CE

both new alternators have been aftermarket. I'm using 80volts and just discovered the owners manual calls for 70. does this have an impact?

Higher voltage output is not the problem. There appears to be a short in the circuit somewhere.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

cal, can you quickly explain the alternator circuit. Where it starts and stops.