You should disconnect the electrical harness connector for the circuit being tested and enable the circuit and/or system being tested. You should turn in the ignition, with the engine off, turn on the engine, the circuit, and/or system with a scan tool in output controls and the switch for the circuit and/or system being tested. Then, you should select the V (AC) or V (DC) position on the DMM, and connect the positive lead of the DMM to the point of the circuit to be tested and the negative lead of the DMM to a good ground.
By BobGM Specialist
01/11/2022