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RETIRED
Join Date: Jul 1999
Location: BOULDER Colorado
Posts: 39,412
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If not driving....at the battery terminals.
12.5v at rest
13-13.5 at idle
13.5-14 at 2500 rpms.....
over 14v is/can be a problem........
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1983/3.6, backdate to long hood
2012 ML350 3.0 Turbo Diesel
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