i tried to wire up the Dixco tac in my truck, came back with a problem. now there are only 3 wires, 2 thick, 1 thin, for the thick ones there is a white and a black (power & ground) then the thin is a green (light). now i guessed white was power so i hooked it up the the HEI's tac prong. then ground the black, turned it on and nothing. it didnt even move. switched the wires and it was pegged on 8 grand. so does this mean my tac is bad or since its so old just not compatable with the HEI? thanks guys.