go to the fuse box in the car (located about a foot below and left of the steering wheel there is a pannel you can pull of that says FUSES). when looking at the fuse box, directly above the actual fuses are 4 (more or less) male faston connectors. the one all the way to left is a constant 12v, the 3rd from the left shows 12v when the car is on. depending on you, hook up the + wire to one of those with a female faston. connect a ring terminal to the ground wire, and use a screw to connect it to ground (any non painted metal)