I had a 2000 Excel but that was too many years ago for my limited memory banks. Ours turn on just inside the entry door as part of a 3 switch panel. My suggestion is to call the Excel Service Center in Smith Center, Ks. It was opened in the old manufacturing facility by some former employees who are experts on all things Excel. They have been open for a couple of years now and have established a great reputation for quality service for both Excel products and any other brand. I bet they could point you in the right direction. Their number is 785-686-3080.
JimT
2020 Jayco Pinnacle 32RLTS, 2020 Ford F350, Platinum, 6.7 diesel, 4X4, CCLB, SRW, 12,400 GVWR