following the advice from many others, I am upgrading to a digital thermostat. I purchased a unit at Menards and after failing to first time, did some more homework and attempted again tonight improving my results by half. The furnace worked like a charm. The AC unit no so much. It kicks on but the blower does not function. I connected only the high fan wire and left the low fan blank. I also did not connect the 7.5v lead to anything. This is going in a 2011 Puma 25BH and the new thermostat is a LUX DMH110.
One question I had was other more expensive units say they can run off of battery alone and do not need 24v supplied. This unit does not say that, so I'm wondering if that will matter. I called LUX directly and was told the unit is not made for an RV so they were of little to no help. I'm hoping that many of your are smarter than I am and can offer some suggestions.
Chris stole my comments Both leads must be connected for hi fan to work
Les
2000 Ford F-250SD, XLT, 4X4 Off Road, SuperCab
w/ 6.8L (415 C.I.) V-10/3:73LS/4R100
Banks Power Pack w/Trans Command & OttoMind
Sold Trailer - not RV'ing at this point in time
Offline
Both leads must be connected for hi fan to work 
