Brake lights stay on (except third light) while truck was parked

Rats can cause issues with wiring, that's for sure. Can you look under the truck to see if there is any obvious damage? Let's start by checking the fuses # BCM 4 BCM 6 BCM 7 on the right side of the dash fuse panel. This guide can help, and I have included the fuse locations as well. If the fuses and wiring harnesses are okay the BCM could be going out but to be sure let's do a CAN scan which is easy to do, this guide and video will show you how. They have CAN scanners for about $40.00 now on Amazon.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

and

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

would a scan from AutoZone show something? I'll check the other stuff first(tonight). I have a friend that has a SnapOn scanner but didn't want to bother him yet. Thank you for your help and I'll update ASAP.

So, I checked the fuses with the key on and found the LH side #33(spare) has no power on either side of fuse and on the RH side #10(cargo) has no power either side of the fuse. Otherwise, all other basic fuses on these panels have power on both sides.

Yep, that is normal. The power is supplied by the BCM through the fuse then onto the lights. I would do a CAN scan to confirm the failure. You can use the scanner for other car repairs as well.

Looks like the Block. Fuse and Relay Box. Fuse And Relay Center is shorting out. I brought it to my buddy's shop and we scanned it and checked all around and it appears the fuse/relay box is the problem. None in stock locally as they seem to be having problems with them. Hopefully I will have it mid-week and I'll update if that is the fix.

Yep, it happens, let me know what you find out when the parts comes in.

It fixed the problem.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

Thank you.