Check the specifications of the cables or harnesses that you are checking to see what the electrical voltage is supposed to be.
Make sure that you are standing a safe location. Electricity can be dangerous, no matter how small the voltage; do not stand in any water or on wooden boards when using the meter. A concrete floor or insulated pad is best.
Connect the black lead line on the tester to the grounded component of the cable being tested.
Connect the red test line to the live cable being tested and read the voltage on the meter.
- Always disconnect the red line from the testing meter first.