How To Check What Is Draining My Car Battery. Then take your voltmeter and attach it across the battery terminals red to and black to -. In summary a faulty alternator can drain your vehicles battery.
A short circuit may cause excessive current drawand drain your batteryCheck the chargingsystem for a loose or worn-out alternator belt problems inthe circuit loose disconnected or broken wires or afailing alternator. Touch the test light pick to the ground battery post. In summary a faulty alternator can drain your vehicles battery.
Use a multimeter and these step-by-step instructions to perform voltage drop tests to isolate.
Touch the test light pick to the ground battery post. If the test light does not light or glow there is no drain in your battery. To test whether an alternator is draining the battery with the cars engine switched off disconnect the cars electrical system leaving the battery only. Hopefully these two steps help you confirm or rule out the possibility of an alternator draining the battery.
