Another thing to do, once you already there, is to cut wires from the headlights and run them though relays, getting power from the "+" wire and attaching ground wire somewhere under the hood - it will make your dimmer to live longer and lights shine brighter. This is due to the Isuzu run ground wire via dimmer switch, so some power is lost on the long wire to the steering wheel then to the ground, and each time you use dimmer it connects high amperes...