Can A Bad Alternator Drain The Battery Overnight. Answer 1 of 5. However we talk through some common signs in the paragraphs below.

Bad Alternator vs Bad Battery. For what its worth I have essentially zero faith in autozoneadvanceetc battery and alternator testing stations. Driving short distances is also a cause for draining your battery.
Batteries are not meant to be drained fully.
I get about 2-3 days of daytime driving maybe 10-15 starts before the battery would be drained. If your battery is dying overnight there are three possibilities. The battery could take and hold a charge out of the car but not in it. For what its worth I have essentially zero faith in autozoneadvanceetc battery and alternator testing stations.

