Okay, the positive is the metal plate on the left, holding the left side of the bulb. I attached a wire here- (sorry it's out of focus)
The negative you need to use is the big waffle plate on the back-
I ran the two wires along the roof, down the pillar and under the truck to half of the lights. I used teh rear dome to power the other half of the lights. I have these-
In the wheelwells, grill, by the front "skid plate", under the front doors and under the rear bumper. I bought the strips here-
http://glowproled.bigcartel.com/ You can buy a big roll of the led strip and solder wires to the desired length of strip as well. I took the lazy route.