This weekend My tail lights went wacky.

I get a ding in the cab, Then if I press the brakes, I only get the light on the cab. I only get right blinker. When I put it on left blinker I get the ding and fast blinking. All lights on the front of the truck work. Cab brake light works. Right Rear works. Both reverse lights work. Both plate lights work.

Please don't tell me it is the control module.

 

Switch out the panels. Just take the whole assembly out, then switch sides. If the problem moves, then it is the panels. If not...

 

Thankfully only a bulb. Changed the rear driver. The bulb looked good. Learned from my Jetta to change all the bulbs at the same time.