Troubleshooting No Trailer Running Lights with 2017 Ram 1500

Question:

My 7 pin connector on my ram1500 all pins work except #3 pin is there a separate fuse or setting for running lights

asked by: Dave

Expert Reply:

If the trailer running lights circuit isn't active on the 7-Way of your 2017 Ram 1500 then you will want to check the 20 amp blue fuse located in the F29 position inside the power distribution box under the hood. The online version of the owner's manual for your Ram shows this fuse as being in charge of this particular circuit.

If replacing the fuse does not resolve the issue please let me know and I will be happy to look into this further.

expert reply by: Chris R

Laura

3/2/2024

I have the same issue. Changed 28,29,and #30 fuses trying to troubleshoot with no improvement!! Plugged the trailer into another truck, everything worked. Hooked up a jumper cable to the truck and trailer to make sure there was a good ground, no improvement. Plugged in a tester to the 7-pin, there is no power to the TM light. Brakes, turn signals and hazards all illuminate.

Mike L.

3/4/2024

@Laura Let's rule out the trailer connector on the vehicle as being the problem. Unplug the harness from the rear of the 7-way trailer connector. Make note of where the socket is that feeds the wire in the 11:00 position. Test that socket using a circuit tester like # PTW2993 while the running lamps are turned on. If you get signal at that socket, then the 7-way connector is bad, replace it with # HM40975. If you DO NOT get a signal on that socket, then there's a wiring problem somewhere between that socket and the fuse box. At that point, you'd probably want to have a mechanic fix it.