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RETIRED
Join Date: Jul 1999
Location: BOULDER Colorado
Posts: 39,412
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Get a multimeter and test the battery at the terminals.
12.5 at rest
12.5-13 at idle
13.5-14 at 2500 rpms......
Over 14 and you have a regulator issue, under 12.5 your alternator is going....
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1983/3.6, backdate to long hood
2012 ML350 3.0 Turbo Diesel
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