tail light problem
I'm having a problem that I can't track.
It's a std 2 wire setup. The brake lights work when the headlights are off (I checked and have 12v at the 1st wire on both sides), when the HL's are on the brake lights stop working and the tailights don't come on (I checked and have 12v at both wires on both sides). When I let off the brake with the HL's on the taillights still don't come on (I checked and now have 12v at the 2nd wire on both sides). So i'm uber confused cause according to the vt meter everything should be working??? I have tried multiple bulbs to make sure no internal bulb shorts.