I have a 70 Dart and got the EZ wiring 21 circuit harness. I have mounted the fuse box and have all the wires ran. I started at the rear, hooking up lights. The three wires in the rear are labeled: 1. Left/Right backup 2. Left/Right Turn 3. LEFT/Right Tail Park My question is how are the taillights grounded? I see three wires in the tail light plugs: 1. Backup: Pink 2. Tail: black 3. Brake: green Under the dash, there is: Brake switch power Brake switch So I hooked both of those wires to the brake light switch and applied 12V to the power wire and got nothing when I pushed on the brake. Do the housings need to be mounted? Currently they are not. Any help would be appreciated.