Greetings, we set up for the first time with our 2009 3670rl. So fa so good, after locating a leak on the bathroom faucet. Fortunately all that took was tightening the nut underneath. My question is about the red light on the panel marked "heater". In our previous tow trailer, I think it came on when we were either out of gas, or when it was not lit. The light in the bighorn is constantly on, although everything seems to be working fine. Should the light always be on????? Or will it go out when we run out of gas???? Sorry for long winded question....it's what I do.