I'm trying to fix my '72's wiring for the first time, pardon my ignorance! After a major drivetrain swap/springover and 2-3 years of not being used,I had no lights to start with. I figured out with a test light the power to the headlight switch wasn't working. Cleaned and fixed that. Got the front lights working but no tailights. The wiring from the firewall plug to the tail lights is so cobbled up, I need to run new wires. I am starting at the 4 wire plug on the firewall. I know the top right prong is the running lights-all green wire. Bottom right prong R signal-green w/yellow stripe. Bottom left prong L signal-green w/red stripe. When I hit the brake pedal, both the turn signal prongs light up. Is this correct? Also, the top left prong yellow w/red stripe-no power at any time. I would have thought that would feed the brake lights, not the two signals? Can you figure out what I'm asking and help an electrical retard? TIA