How do you test a turn signal on a trailer?

Engage the right side blinker and disconnect the cable between the trailer and the truck. Take your test light and find a good ground and use the probe to alternately touch each of pins inside the connector. The test light should alternately go on and off – if not your problem is in the connector.

How do I troubleshoot a trailer wiring problem?

If you are using a battery charger, connect the negative cable to the white wire pin (ground) on the trailer plug and connect the positive battery charger lead to the yellow wire pin. If you are using a tow vehicle, turn the left turn signal on. The left turn light should come on. If it doesn’t, first check the bulb, then the wiring to it.

What to do if your right turn signal is not working?

First, disconnect the trailer from the tow vehicle so you can check the vehicle side connector. Using a circuit tester like part # 40376, test the functions of the connector; specifically check the right turn/brake, to make sure the signal is making it to the connector.

Why do the tail lights work but not the turn signal?

The tail lights work but not the turn signal. The left front flashes rapidly and the right side signals work so I figure it’s not the flasher unit. is there something else I should be considering? *#&! electrical problems! Could be a broken wire going to the brake light switch . Since the brake

Why are my trailer lights not working properly?

There should be an indicator for each individual function. If the tester responds to each individual system, the trailer wiring system is probably the cause of the problem. If one or several test results do not provide a response from the tester, the tow vehicle itself might be the problem.

Why is my right turn signal not working?

If it is a wiring problem, and not a hardware problem, replacing the whole light will not help as the malfunction is in the wiring. Sometimes, trailer lights ground through the mounting studs. Make sure the connection point is free of rust and corrosion as that could cause a bad ground.

How can I troubleshoot a wiring problem on my trailer?

Perhaps the most helpful thing you can do to start troubleshooting is to determine whether the problem is on the tow vehicle or on the trailer. When you use your trailer to test, you have no way to know for certain whether the problem stems from an issue with the wiring harness because the trailer’s wiring system is still part of the equation.