Yeah, I don't have a physical switch wired thru the firewall either. I just use a FOB to turn the light on and off (for me when the high beams are on). One thing on my wireless switch is that when it is not getting constant power to the switch (the trigger wire), it always defaults to on (when it gets power). So when you wire it up with your relay, you need to feed power from the battery right to the wireless switch for the trigger wire, which then also means that you can turn the light on and off without the car actually being on....which I didn't like. Don't know if my wireless switch is stupid like that (defaults to on when it gets power from the trigger) or if you can get one that is different!!! Good luck!
BTW - I may get a SVO grille with the design more like a Sport to let a bit more light through the grille!!
It didn't come with the wireless switch. Had to buy seperately but its cheap. Here's a link to the one I got on Amazon. Also gives you a quick idea on how it wires in...Does the light bar come with a remote or can you link to the what you bought to make it remote-operated? Thanks