Rear brake,reverse, hazard lights don’t work. Tail lights and 3rd brake light works. Replaced bulbs and multifunction switch on steering column, which the reset has already quit working after blinker actuation now( another ordered) and replaced blown fuse under the hood. Now lights and gauges on the dash are losing power and resetting repeatedly but doesn’t affect drivability any. Wondering if it’s the BCM. Please help

 

Welcome to the site, could be a loose ground wire or loose fuses and relays in the fuse boxes.

 

Be afraid! Skynet is coming. Computers will kill all of the meat bags.
More likely a short somewhere, that is the cause of blown fuses. Was there any work done just before this started? Any after market equipment?
Trailer adapter ever installed or removed? (Most likely culprit.)
Any LEDs involved?
Brake pedal position sensors?
What fuse was blown?
What about the license plate light? What about the side marker lights?
There is a splice where all of the rear lights, except the CHMSL go through. I think it is under the right rear lights

 

Salvaged title so who knows what happened to it. No aftermarket anything that I can see. Just picked it up until my truck gets back from motor replacement. All side marker and plate lights work, haven’t tested the brake switch since the hatch brake light works. Believe it was fuse 46, have to check to be sure(10a). I’ll also check the splice near the taillight. Thank you

 

The CMHSL is on a different circuit from the brake lights. My bet is you will find a place where a trailer adapter was ripped out, look in both rear cavities at the tail lights.
Fuse #69 and relay #68 control all of the lamps, except the head lights and the CHMSL. Find which one blows the fuse.

 

Replaced the fuse, reverse lights work now but still no brake lights, but it hasn’t blown a fuse that’s been replaced. Looked in the taillight wells and the space around the battery, no connector or splice point in the wiring anywhere. All looks good. I’ll throw in the new multifunction switch tomorr after I figure out why it’s breaking the end tab that resets the blinker arm, an move to the brake light switch if that doesn’t work

 

What brake bulbs did you install? There's a link in donbrew's signature for a free digital owner manual, that will show you (among other things) which bulbs you should be using.