Trailer brake light fuse.

I have a 2018 DCLB 4x4 SR5. This evening I came home after taking my boat out. My wife noticed the trailer brake lights were not working. Running lights do work but brake and turn signals do not. I am working the night shift so I didn't have time to troubleshoot before work. The trailer is fairly new and has LED lights with wired grounds. I was wondering which fuse powers the trailer brake lights and turn signals. The fuse diagrams I was able to find online show some fuses labeled towing but nothing labeled towing brake lights. I figured I would gather info before troubleshooting after work in the morning. Thanks.

 

Pretty sure its the same 2nd or 3rd gen, but you are not the first to have this issue.
https://www.tacomaworld.com/threads/trailer-brake-lights-not-working.235312/

 

I’ve got a similar issue. All lights work except the brake lights. My 2008 SR5 has the factory towing package so I know it wasn’t a previous owner’s shoddy wiring. That actually concerns me even more. Now I’ve got to try and figure out how to troubleshoot something being wrong with factory trailer wiring.

 

Sub'd for solution.

 

Update and more info. After work I verified voltage to the left and right brake light pins on the 7 to 5 pin adapter. I then disconnected the brake lights and found no voltage to the brake lights. The trailer is a 2016 Karavan aluminum boat trailer with LED lighting. I thought the wiring ran continuous from the 5 pin connector all the way back to the lights. I noticed the wires changed colors at one of the steel cross members and realized there must be connections I could not see. I found 2 extra feet of wiring tucked into a cross member with connections. The cross member fills up with salt water every time I dunk the trailer and must drain slowly. The brake light connections had completely corroded and snapped off. The running light connections were intact. I cut a lot of the slack out of the wires and spliced them back together and heat shrinked the connections. I initiailly suspected the fuse in the truck because both brake lights were not working. Lights work great now.