Well, I'm gonna take a shot at this. Somewhere in your coach (probably kitchen area), there should be a vented door, could be a metal or plastic door. Your converter should be there. There are fuses for the 12v power supply and breakers for the 110v side. Not, sure if this helps you any, but since no-one else typed in, thought I'd try.
Also, welcome to the Sunliners group, we "KNOW" that we are a group of folks that own WONDERFUL COACHES !!!!
Sunny #18 2003 F-344SR #8157
Sunny #19 1997 T-2653 #5485
1999 Ford F350XLT DRW Crew Cab, Long bed 7.3 PSD
2002 VW Jetta TDI.. AKA: Kitty's Kruiser