Posted by guido on December 01, 2020 at 12:25:41 from (72.82.163.139):
In Reply to: batteries posted by HenryO on December 01, 2020 at 11:31:41:
Hello HenryO,
Battery voltage at rest is 12.6 volts @ 80* F. Ambient temperature is seldom mentioned, but it is relevant and should be considered at all times and temps. AS you stated AGM batteries require a higher voltage setting 14-15 volts If underway you mean with the engine running, May be you your car has that kind of battery?
If the engine starts fine then the battery is O.K. Are you taking voltage readings at the alternator + terminal? With the engine off that voltage reading has no meaning. If that is the case, it is not a volt testing lug, that is output voltage.
Battery voltage is what is important, and the output voltage will vary with load and engine R.P.M.'s anyway. Some time it is thee same voltage on the alternator lug and the battery though,
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