Well this the answer I got when I asked Orr-Fab
Re: Light Bar
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To be honest this isnt my rig. I work for a lift manufaturer and this vehicle was given to us to test lifts.
The front (grill) lights had an auxillary outlet and its own switch, so no extra battery was needed. I dont think that the owner of the vehicle ever connected, at least while we had the rig, the lights on the headache rack. Sorry I cant give you more info as I havent seen this truck in a couple years now and really only spent minimal time on it.