What Would Cause Car Battery To Drain. Parasitic drain on the battery. Electric devices like timed and dimming dome lights can stay awake and produce excessive drain on the battery for up to 10 minutes.
The mission of the alternator is to charge the battery while the car is running. You can prevent the battery from draining by following these simple tips. To know why it happens you have to first understand how a starter works in a car.
Contrary to popular belief there are quite a few things that can happen which lead to drained batteries even if you already equipped the best rated car batteries.
Parasitic drain is another common cause of why a car battery died overnight. We have two possibilities. I usually change my car battery every 3 years. Measure the current flow from the battery to the alternator Alternator battery drain test The alternator battery drain test may require a qualified mechanic.
