[salmonboy]

2017 Tundra. Other trailer lights work except running lights. must be a separate fuse.I see what I think is a relay labeled towing but not a fuse.

 

[koditten]

Have yo metered the plug on the truck?

Or just make the dealer fix it, seeing how its a 2017.

 

[salmonboy]

Yes, I have checked that no power comes through the plug. Turn and brake check ok.

 

[Hollywood D]

Is it possible the running lights only come on if the headlights are on? Have you checked the trailer wiring?

 

[riccnick]

There is a fuse marked "TRL TL" or something like that in the fusebox under the hood. It stands for "Trailer Tail Lights", meaning marker lights. It gets power with your parking lights and headlights. There is also one for the trailer brake lights, marked something like "TRL BRK". I've had it pop a few times before when inserting a 7-blade plug. If the terminals are corroded or the plug is too tight of a fit, you have to wiggle it back and forth, and I think that causes it to temporarily arc and short.

 

[Bluewoo]

Make sure key is on/with lights being on?

 

[jplear]

Make sure the lights work by hooking up to something else. Just to isolate the truck before getting to carried away.

 

[Koder]

In the 2017 Tundra and later, The fuse is marked TOW TAIL. It powers just the Trailer Running Lights.

There is a fuse marked "TRL TL" or something like that in the fusebox under the hood. It stands for "Trailer Tail Lights", meaning marker lights. It gets power with your parking lights and headlights. There is also one for the trailer brake lights, marked something like "TRL BRK". I've had it pop a few times before when inserting a 7-blade plug. If the terminals are corroded or the plug is too tight of a fit, you have to wiggle it back and forth, and I think that causes it to temporarily arc and short.