Why Arent My Parking and Running Lights Working on My Trailer after Changing Fuse?

Question:

All trailer lights work except parking and running lights. Changed f29 20A fuse yellow

asked by: Chuck

Expert Reply:

From the sounds of your question, you tried changing the 29 A20 fuse for the trailer parking lights on your 2015 Ram 1500. If you are still not receiving a parking and running light signal to your trailer's lights, there is most likely a short on the wiring, fraying, corrosion in the plug connectors, or a bad ground on the tail/marker wire (typically a brown wire). I went ahead and attached a wiring diagram to show you how the tail/marker wire connects to your tail lights.

One way to help determine the issue is to use a circuit tester like the # PTW2992 to see if you are receiving power to the tail/marker wire. If you are not receiving any power reading on the brown wire, I recommend cleaning out the connector plugs and making sure the ground wires are connected to a clean and corrosion-free bare metal surface. Also, it may be helpful to test the tail light pin on your 1500 to make sure that the fuse is proving power to the trailer.

expert reply by: Bob C