On my truck, the lock/unlock is wired to my HID's. Sometimes when they flash, only one will flash - when that happens only one of the headlights will turn on when I start my truck. I have checked all of the connections, but I remember reading in the manual that came with the kit "not to operate for less than 30 minutes" or some such bull****. No damage done so far, I sometimes just have to turn my lights off then back on to get them both on. Bulbs are cheap anyways ...