My "whoop whoop" lights (convoy lights) quit working. I checked the breaker on my overhead console it's run through and sure enough it was popped, telling me either I was grounding out somewhere or amping out due to a frozen motor.
I disconnected the lights from the relay and tested and it didn't pop, so my trouble was "downstream" of the power/switch/relay side.
I disconnected them both at the "Y" connector and it didn't pop, plugged them in one at a time and the issue was the right light.
I disassembled the light and checked the motor, it spun freely.
After removing some electrical tape put there by a previous owner, I found the insulation for the power/ground wires was rotten and allowing them to touch, shorting out the circuit.
A little repair later, all is good!