Originally posted by Oldf100fordman
Plus, coming out of the turn signal switch to the rear, you need a right and left wire to the brake light side of the bulb. You can't run one wire to both bulbs or your turn signal will never work.
yep, thats one of the things that the turn signals do. they take the brake light wire coming into the switch and when it comes out you have 2 wires a right and left going to the rear. when you put on the brakes both lights, light up as brake lights and when you turn on the turn signal to the right the switch cancels out the right brake light and blinks and the left one stays on as a brake light, when you turn left it does the opposite. the 4 way use the same 2 wires, and cancels out both brake lights.