How To Check Current Draw On A Car Battery. Use a multimeter and these step-by-step instructions to perform voltage drop tests to isolate. To check alternator leakage currents you first need to disconnect the battery.
Ideally it should read zero amps and after that dial the lower setting on your amperage scale until you detect the flowing current. Start by removing the negative side battery cable from your car battery this is the black one. Ad Check Current Battery Specials On Any Make Or Model.
An Advanced Auto Parts employee tests a car battery.
A car battery is one of the basic issues behind most of these dilemmas. Test it with the multimeter before and after unplugging. You will want a fully charged battery. One of the diodes may have shorted out and caused current to drain back to the battery.
