2019 Sierra Denali Trailer Brakes not working and other Random Lighting Issues

[JamesPal]

I went to pick up my travel trailer on Monday to get ready to go on a short trip. It has was raining like crazy and everything was wet when I picked it up. After hooking up and getting ready to pull it out of the storage yard, the trailer would not move. The trailer brakes were locked on. I pulled the safety brake cable out and put it back in and the brakes released. The only trailer lights that would work were the running lights, no brakes or turn signals. Also the truck would not recognize the trailer. I dried it out the best I could, then the truck would recognize the trailer, still no lights, but the brake bias would show on the D.I.C and the trailer light came on the trailer brake controller.

Thinking I was making progress I wrapped it up for the night. I came out this morning and plugged the trailer in and same problem as I started with, only the running lights worked. and the truck would not recognize the trailer but not the brakes. So I started checking fuses in the truck. There are seven fuses in the underhood fuse box that are associated with the trailer tow connector:

POS         Usage                Rating

41            Parking Lt          20A

54           Reverse Lt         10A

55           Backup              10A

63           Trailer Battery   30A

73           Stop/Turn Left  10A

81           Stop/Turn Right 10A

84           Brake                 30A

It turned out the Trailer Battery 30A was blown. Drove down to the local auto parts store to get a new fuse and the truck kept telling me the trailer was still hooked up even though it was five miles away. Also when I would turn on the turn signals they would flash quickly like there was a burnt out bulb. I put the new fuse in and guess what? No change. 

Next steps will be checking all the fuses in the trailer. Then off to the dealer for their take on it, but it is looking a lot like the ghost of CAM Bus. 

If anyone has had a similar experience, I would really like to hear your story. BTW- the Travel Trailer is a 2021 Forest River NoBo 19.6. How foolish of me... $125K in trucks and camper and I thought I would avoid all the DIY crap you go through when RVing...