2008 T660 Trailer brake lights don't work

Both sides?

It's a bulk head connector so there's a nut that keeps the male end of the plug from falling up into the fuse panel.

The female end of the connector is attached to a cable that runs the length of your truck to the back of your sleeper. It plugs into the back side of the mount that your pigtail connects to.

 

Thanks ....Just try to make sure I cover all the bases.It just the turn signal and 4 ways on the trailer not working.
I'm going to pull that plug off now.Thanks

 

Hello. Did you fix your problem?
I’m having same issues. No power to trailer stop fuse.

 

No power at the fuse? So no brake lights on truck or trailer?

 

Been chasing similar issue on a 2006 T6. Started with no left turn signal. Checked pig tails and found 2 loose grounds one on the truck and one inside the pig tail. The lights all work now except for the trailer brake lights. I had someone help me with a volt meter, the bottom pin is not getting power when the brakes are applied. This was tested on the 7 way port under the cab.

In short current issue after all that - no trailer brake lights and trailer abs light is on. Not sure what to check next.

 

It usually boils down to a fuse, relay, or both.
Relays are easy to troubleshoot, just swap it with a known good one (I always use the ac compressor relay).
If it's not the relay then it would go back to being a fuse but the hard part is finding where it's located.

 

That’s where I am having trouble…locating and identifying the relays. This truck does not have the fuse panel diagram anymore. Idk which relay is for the trailer brakes or AC to switch them and test. I have tested all fuses and none of them are blown.

 

Post#8 has a picture of my fuse panel. The slot with the white jumper wire is where the relay for the trailer brakes goes.

 

Thanks. I’ll check this in the AM and follow up.