Troubleshooting 12 Volt Accessory Circuit on Trailer Circuit that Stopped Working

Question:

I have a 2003 ram Cummins. There is no 12v power at trailer plug. Is there a fuse that powers this? My #1 fuse in pdc is good. Is there a different fuse?

asked by: Chris

Expert Reply:

Sounds like the fuse or relay that controls the 12 volt power circuit for your trailer wiring has gone out and needs replacing. Check the owners manual of your truck or the fuse diagram on the fuse panel to determine the location of that fuse/relay and replace as necessary. The easiest way to check a blown relay is to install a known working relay in it's place. If the circuit starts working at that point then you know it was the problem.

The other possibility is that there is corrosion on the 12 volt accessory circuit of the 7-way that needs to be cleaned off.

expert reply by: Jameson C