The Best Way to Perform a Voltage Drop Test

Voltage drop testing allows the technician to monitor voltage loss in a circuit. Voltage drop should be checked with the circuit loaded and a fully-charged battery. In best case scenarios, voltage drop on a power side or ground side to a component through all connectors, and connections should not exceed 0.1V or 100mV, however most times 0.2V or 200Mv is acceptable. All voltage should be dropped across the load, not in the wires or connections supplying it power or ground. In this video we will show you how to test voltage drop on a starter motor circuit. This test can be applied to all components in a similar manner.