I run into this every time i change an ignition to an aftermarket unit. I seems in the instructions they allways refer to hooking up to the negative and positive wires. At least the msd I am installing now refers to the wires as black as negative and orange as positive. I dont have a magnetic pickup with that color combo out of the four vehicles with electronic distributors. They are colored black and white. My question is, is the black wire the negative and the white wire the positive or vice versa.