Kevin in Michigan

I have a 2020 Defender Lone Star Edition. While installing the 10" light bar on the front bumper and wiring it to the accessory bus in the dash we found that we have no power to the bus. We have checked everything we can think of but cannot find a problem. All switches, relays and fuses that we are aware of seem to be in working order. Everything is working fine with the exception of the accessory bus and we find that when the key is in the ACC position there is nothing (I assume this is associated specifically to the Accessory bus). Is there any other device located inline to the bus that could possibly have gone bad? We saw in the owners manual that there may be a fusible link, but I have no idea where that could be located and am having a hard time finding a wiring schematic for my machine. We know that it has to be associated with the bus because we were able to get the light working from the battery but it is always on. Unless the wiring is defective or improperly installed (which I believe to be unlikely) I can only guess there is some other inline device that has gone bad. Any help would be greatly appreciated.