What was the wattage on the HID system? I know on our Edges, 35W is fine hooking directly into the factory harness, but 55W definitely needs to be hooked up directly to battery. Ballasts can take up to 2x the amount of power to fire (think fluorescents), so a 35W could possibly take up to 70W and a 55W could require up to 110W momentary power to fire.