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Old 08-11-2000, 12:53 PM
LarryBible
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If your goal is to determine if the alternator is charging the battery, the exact readings are not critical. With the engine off, it will show something like 12.X or less. With the engine running, you should read about 13.4 on up to a little over 14, depending upon the state of the battery at the time. If you're reading mid 13 or better with engine running, the charging system is probably okay.

Good luck,


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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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