Ideally, it should move from right to left as the car battery charges more and more. The charger needle denotes the current being supplied to the car battery. The battery charger needle keeps jumping because of a shorted cell, short in the charging system, internal overload, excessive drain current and faulty connectors. Why is my battery charger needle keeps jumping?

One such problem is the battery charger needle moving back and forth. While in most cases, charging your car’s battery is a straightforward procedure, you often might encounter a problem.

The more miles you cover, the faster this will happen. Sooner than later, you will have to charge your car’s battery.