I just barrowed a friends Prowler. How do you get the freg to operate on gas only. It has buttons that say on off and automatic gas/electic. I pushed the power putton out (On) and pushed the gas button out. Do I need to light a pilot light or something?? I opened the box on the outside of the trailer, but I don't know?? Thaaanks. My friend's dummer than me.