How To Check If Alternator Is Charging Battery. Alternators power the small engine while it is running keeping the battery charged by circulating power back through the system. Battery voltage measured at the terminals with the engine running should be about 137-147 volts.
The first course of action is to check the wiring carefully that runs between the. However this is not a good idea because it could damage. Then start the engine.
While your car is running disconnect the positive battery cable.
Alternators power the small engine while it is running keeping the battery charged by circulating power back through the system. If the battery is below 122 volts then you will need to charge the battery and re-test or try a different method. Very low differences in voltage between the battery and alternator should also be suspect say 128 volts at the battery. That is the output of the alternator at the battery and that range is needed to keep the.
