I have a 77 C20 p/u.
With my headlights off, when I step on my brakes my dash lights come on. When I turn my left blinker on they all flash. With my headlights on, my left blinker doesn't work.
The right blinker works fine with headlights on or off.
I can't figure out the dome light. I checked the socket and there is power with a test light. i checked the plug behind the seat and have no power. The dome or cargo light is not working but the floor light works. Any help would be appreciated.