What Can Drain Your Car Battery Overnight. If your alternator has a bad diode your battery can drain. Bad or shoddy wiring can create a drain that would require a mechanics inspection as well.
In summary a faulty alternator can drain your vehicles battery. Can a bad starter drain a battery overnight. Most common reasons why your battery drains is because you left your headlights overnight clock radio and security alarm that runs after your car is turned off bad charging defective alternator diode and old battery.
Can a bad starter drain a battery overnight.
That is a definite yes. Hopefully these two steps help you confirm or rule out the possibility of an alternator draining the battery. As you can see the problem is not always an obvious one. Can a starter drain a battery overnight.
