Here you can see where I soldered the wires. Just directly onto the back side of the two light connectors. Also, just because the center pin was positive on the rear passenger lights doesn't' mean it's going to be that way everywhere. Good thing I checked. The center is the ground control and the outer pin is the positive. Shouldn't matter anyway since you're soldering directly where the light plugged in anyway. I forgot to mark it, but the outside connections are the negative and the inner connections are positive.