All Trailer Lights but 2 on the Running Light Circuit are Not Working

Question:

Everyone of my running light parking lights tail lights does not work except 2 of them all my brake lights blinkers and everything else work

asked by: Woodrow C

Expert Reply:

The most common problem when trailer lights stop working is a bad ground. This can also be the result of a damaged vehicle connector, damaged trailer connector, some damaged wiring, or even exposed wiring.

Start off by checking your vehicle and trailer connectors for any debris or corrosion and then move to the grounds on your trailer running light circuit, especially the grounds for the lights that are not working. Make sure the grounds are secured to a clean, bare-metal surface as even some paint can cause issues.

If that all looks good then the next probable cause is some damaged wiring or an overload on that circuit. Check your wiring to ensure that it all looks good. If that is the case then try disconnecting your lights one at a time to see if there is too much draw on that circuit.

If none of these solutions work let me know and I can help you troubleshoot further.

expert reply by: Jon G