I agree
The OP must fully Charge the battery (over night) and load test, then check the battery after two days (if it can maintain the state of charge).
Weak battery is bad for the alternator, so we need to start from a steady state which a fully charge battery. eliminate the battery and alternator as the culprit.
Quote:
Originally Posted by trader4
No, 11.9 is not OK, unless the battery has been drained dead. If it's fully
charged it should be 12.7V
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