Here's the facts:
1. 1957 Panel Truck
2. New brake light switch is mounted in truck
3. New wire harness
4. Fuses are in fuse block for parking lights, turn signals, and brakes
5. Testing with one of those square trailer lights
I see no voltages on the brake light switch wires nor the wires that go to the back lights. I had the ignition turned to on, but did not have it running. Pretty sure these lights should work even when the truck is not running, right?
Wish I knew why this truck fights me so hard.