1500 Ram 2020 trailer running lights fuse.

[Cas09]

Good morning, new here, but just acquired a camper and was towing it out when I realized that the running lights were out. I had brake and turning lights but not the running lights. It was suggested that it is the fuse. I am having trouble locating this fuse or what is would be listed under in the fuse box listing. If you have any information or advice on this issue I would gladly appreciate it.

 

[llando88]

Assuming a new ish 5th gen Ram I'd probably suspect the camper, not the truck, to be honest.

Can you verify the pin out of either the 4 or 7 way connection using a voltmeter to confirm there is 12V being supplied to the camper for the running lights?

Trailer Wiring Diagram and Installation Help - Towing 101

This trailer wiring guide comes complete with a color coded trailer wiring diagram for each plug type, including a 7 pin trailer wiring diagram, this guide walks through various trailer wiring installation solution, including custom wiring, splice-in wiring and replacement wiring. If your...

www.curtmfg.com

Fuses are listed in tabular form on page 394 of my Owner's Manual for my '21 Big Horn, perhaps they are in yours as well. The ones associated with towing lights are F08 through F12, located in the External Power Distribution Center, left side engine bay looking forward, near the battery.

I would guess the running lamps are a cartridge fuse, F12, but it'd depend on your truck.

 

[Wildhawk107]

Another possibility

I had the same issue, the truck seemed good, fuses were fine, trailer worked when connected to other brand trucks but not on my 2025 Ram Rabel.

Ram said it was the trailer, the trailer shop said it was Ram. It turns out that there were too many incandescent running lights for the truck to handle and it was throwing a code and turning them off as a safety feature.

Try removing the bulbs from your trailer and reinsert them one at a time to see the number of bulbs your truck can handle. I could run all but 2 of mine. My solution was to replace the center rear 3 running lights with one LED strip which lowered the draw enough for all to work without issue.

 

[mesquite5010]

I had this issue with my trailer lights. It was a fuse in the truck. I don’t remember which one but it was definitely under the hood in the fuse box near the battery.


Sent from my iPhone using Tapatalk

 

[delldude405]

Just replaced my f12 20amp fuse for this exact issue. I had no running lights but had brake and turn signals