ya problem is it sparks the bulbs for a second and goes out.. the original one doesnt do anything now, the one i bought used just sparks and stops, yes same harness, it only does two bulbs, i have checked all the pins and everything and I have new bulbs just thought maybe if someone had easy access with a 660 ballast i can test these ones out. I will probably order a workhorse 7 always had good luck with them, the other lights are work horse 5's just wanna get this figured out so i can sell the system working properly.