Thread: 91 420 sel- new alt, should I replace?
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Old 11-01-2007, 08:24 PM
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Cigar Havana Cigar Havana is offline
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Join Date: Jan 2003
Location: London Ontario Canada
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Check voltage
Lots of other posts address how to check an alternator.

What is the voltage at the battery, engine off?

What is the voltage at the battery with the engine on and running?
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1989 420 SEL
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