If you do not have a disconnect switch on the battery, (a prior owner may have added one, Sunline did not as standard in 95 add them) you have to unhook the negative cable from the battery each time you are done camping. If not, as Mack said, there are things inside the camper that can and will drain a new battery. There is no way to shut off the LP gas detector inside short of pulling the fuse. There are other things that can be left on, the radio clock, the power roof antenna if you have one. There may be others, those 3 are the most general offenders.
As Gene said, there is no gas shutoff at the furnace as it came from Sunline. If you do not hear the fan running when you turn up the T stat, that is problem 1. First is to see if 12 volt power is even going to the furnace. A fuse blown in the power converter panel or the sometimes Atwood has a breaker behind the cover outside. The newer models do, I do not know about the 95 units. If you have power and still no fan, then this is going to get deeper into trouble shooting. Are you electrically friendly and have a volt/ohm meter and know how to use it?
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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