Freightliner/Fltwd 2003 Revolution. Looking for a fuse.

Hi folks. We lost 12 volts to the chassis stud in the left front corner cabinet under the driving position. Somewhere between that stud and the batteries is a main line fuse. This happened when we turned on the headlights. I believe the headlight switch is faulty and there was a dead short to ground. Chassis side went dead and of course the cummins quit as none of the automotive relays could energize. It was a bad situation and in bad weather so we just pulled the headlight fuse and Angela built a temporary fused jumper that we connected to the aux/coach stud about 16 inches away and got ourselves up and running. Ran that way for 800 miles until we got home and just didn’t have any headlights. Now we need to find the fuse. I suspect by the size of the cable it will be 50 to 100 amps. It is not visible underneath the coach or at the back but honestly it was not ideal conditions to find it and we trying to avoid a tow. Angela thinks there might be room in the main kill switch housing but can’t see Fleetwood sticking it in there. Any ideas.

Thanks in advance.

2003 Revolution. 40C