Hello, I too have made the grave mistake of reverse hookup of the battery. It burned the ground wire to the support. I replaced and repaired what I’ve found so far. I have variety problems still but my main concern today are the signals. I have power to start, run and drive. But when I turn on the headlights both directional arrows light up. When I signal either way, the opposite arrow stays lit and flashes only once. I replaced the headlight switch in hopes to fix the problem but all I got is a shiny new switch. When the headlights are off the signals work but seem labored. I’m working on a 85 c20 with the 350 gas engine. Please help me fix this problem as my butt is starting to hurt from kicking it. Thank you in advance.