4 Pin Trailer Lights Not Working

All is not lost however and there are ways to keep your trailer lights working properly.

4 pin trailer lights not working. It is possible that one of the bulbs on your trailer burned out. Photo 2 to the connector pin and then clip the other end to the continuity tester. The trailer uses a 7 pin with brakes turn signals stop lights hot tab running lights. Brake and turn singles work but not my running lights within the brake turn and running bulb.

Clean both connector plugs clean the trailer light wiring connectors. Trailer lights not working using 4 to 7 way adapter on a 2012 mercedes gl450. Many standard trailer lights use traditional incandescent bulbs. What s weird is i have 12 4 volts going to all pins on the plug and yet the running lights still don t work.

The light itself is a single bulb light so not a blown bulb. I checked the connector again to make sure that i fit it right. If the light fails to go on trace the. 5 pin trailer wiring is very similar to 4 pin wiring but it adds in a blue wire for the reverse or backup lights.

All lights work except for the utility trailer running lights. Utility trailer i am using a 7 pin to 4 that includes brakes turn signals stop lights and running lights. Trailer and tow vehicle brake lights not working when 7 pin trailer is connected to 4 pin vehicle. Yesterday i was about to tow a trailer but then the trailer lights are blinking.

It still gives me the same result. When your trailer lights aren t working your trailer is not working and you are losing valuable time and money. If you can tell me if you are have a factory installed wiring harness or an. If you do not have a running light signal on the pin closest to the exposed ground pin on your connector see photo then we know the problem is on the vehicle side.

Hi i recently bought from you guys a 7 pin to 4 pin connector. Troubleshooting trailer running lights circuit not functioning on fifth wheel. All other running lights work around the trailer. Trailer 4 way connector has 5 wires on it and can t get running lights to work.

Trailer lights not working solution. While these may be perfectly functional when the trailer is new over time the seals around the removable lens covers fail allowing water into the light cases. So check the lights. Not all trailers have reverse lights so consider your own trailer as you wire in a 5 way plug.

Probe inside the socket with the tester you ll see the color of the wire that connects to the socket inside. Keeping the lights on. The best way to solve your trailer lights wiring issue is to eliminate possible problems one by one until you have pinpointed the root cause of the malfunction. All trailer taillight functions work except running lights.