![]() If your vehicle’s battery is 12 volts, the multimeter should read 12-12.6V in each positive terminal when the light is on. When the light is glowing, your trailer light connector should receive maximum voltage from the battery at that specific terminal.After the probe connection, turn on the light of that specific terminal, such as the rear or front.Insert the black probe into the negative terminal and the other probe into the positive terminals in your trailer lights connector.For testing voltage, set your multimeter to DC voltage.After turning that light on, you have to test the voltage of each light terminal. ![]() We’ll also test the voltage of the trailer brake lights. Test 2: Test voltage in trailer light connector Your multimeter should read around 3 ohms in the trailer light connector’s negative and all positive terminals. Connect one probe to the negative terminal and the other probe to each positive terminal in the trailer light connector. Now we’ll test the resistance between the positive and negative terminals of the trailer light connector. The circuit is damaged if the multimeter reads above the ideal reading. The multimeter should read around 0-.3 ohms in the negative pin and your car’s ground. You can connect probes in any direction, as resistance has no direction. Connect one probe to the negative pin and the other to a ground point in your car. Test 1: Test resistance in trailer light connectorįirst, you must test resistance in your car’s negative pin of trailer brakes and a ground connection.įor this, set your multimeter to ohms. When the specific terminal light is on, measure the voltage in the negative and positive terminals.Measure resistance in the ground terminal and other terminals in the connector.Measure resistance in the ground terminal in the connector and grounding point in the vehicle.Identify terminals of the trailer light’s connector.How to test trailer lights with a multimeter How to test 4 pin trailer plug with a multimeter?.How to test trailer lights without a vehicle?.How to check the ground on trailer wiring?.How to test 7 pin trailer plug with a multimeter?.Test 2: Test voltage in trailer light connector.Test 1: Test resistance in trailer light connector.How to test trailer lights with a multimeter.
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