monitor panel

I have not used my TM for about 1 month and in getting it ready for this weekend. After many trys I got my Refer to start on Gas. But in checking my monitr panel nothing would lite up.???? Dealer installed a Solar panel and that panel works fine. And my monitor panel worked the first and only time I used the TM last month. Called the dealer and he said ck the fuse. Which I did and it look fine to me. So I thought perhaps some of the wires behind the panel were loose I looked under the sink and nothing look undone. Any ideas on what to do????

My main battery fuse looked just fine, but when I changed it, everything began to work. They are cheap...I'd start there.