How Do You Perform A Voltage Drop Test. Voltage drops must be measured in a live functioning circuit with current flowing. Use this voltage drop test to check each ground circuit at the ECM harness refer to vehicles service manual for correct pinouts.
And the best way to test this is to measure voltage drop with the circuit working. Your trouble point will be the previous one to this point. Voltage drop is the amount of voltage lost as it passes through a component or resistance in a circuit.
How do you perform a voltage drop test.
A parasitic draw test is required when a vehicle battery becomes discharged with the key in the off position. Connect the negative - test lead to the negative battery terminal. A parasitic draw test is required when a vehicle battery becomes discharged with the key in the off position. A voltage drop test will assess voltage losses at the battery the alternator and the starter.
