What Would Cause A Battery To Drain Overnight. If it is you should see the battery or alternator light on it indicates that the alternator is not creating the necessary voltage to charge the battery. A faulty or bad starter system can drain your cars battery leaving it useless when in need.
Whatever was causing the battery drain has stopped. Your car battery is still powering some components once the engine is turned off such as the clock and anti-theft features. What Can Drain A Car Battery.
To know why it happens you have to first understand how a starter works in a car.
Read on and learn about the 6 most common reasons that may suck the juice of your car battery. It definatly a relay clicking cause of low voltage charge your battery then disconnect the negative lead from the battery put a test light from the negative battery cable to the negative battery post if it lights up you got a drain somewhere if you do leave the test light where it is and start pulling your fuses one at a time when you pull a fuse and the test light goes out that is the circut. A short circuit may cause excessive current draw and drain your battery. Discussion Starter 1 Apr 13 2012.
