Trailer /Wiring Harness Right Turn Signal Does Not Work with Harness # 118379 Installed

Question:

Installed part 118379...check Connected male pigtail to female connector coming from truck as a quick way to test...check Parking lights...check Left turn signal...check Right turn signal...no worky

asked by: Bruce B

Expert Reply:

We can't have things no worky when they need to worky. So you have running lights, left turn signal, but no right turn signal. What about brake lights? If the brake light is out on the right side as well then it could be several things. It could be a problem internal to the light itself such as a bulb, broken wire, or a weak ground.

If the brake lights work on both sides then it could be a bent or broken pin where the wiring harness # 118379 plugs into the vehicle on either the vehicle or wiring harness connectors.

Weak grounds can cause all sorts of strange things to occur. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light but can show up any time.

Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces.

The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.

expert reply by: Michael H