bubberxt56
Member
I am at my Wits end. Had a dirt dauber build a nest in the squirrel cage on the heater. Pulled heater and cleaned out nest. Re-installed and hooked up the heater, did not try it as it was still 90+ degrees. the thermostat had a broken pin that changes it from cool to heat so I decided to get a new one. Being that the thermostat I had was one for a heat pump, and I do not have a heat pump, I went online to see what one I needed. Talked to a fellow that goes by rvjunky and he had a store that sells RV parts. I gave him the number on the control board and he matched it with the right thermostat a Dometic part no. 3106995.032. Hooked the new thermostat up as per drawings, turn switch to furnace...15 amp fuse blows as soon as I turn it on. replaced fuse tried again..same thing. Went back to furnace to check for bare or pinched wires grounding out..nothing. Pulled furnace out and set up on a bench with 12v from a battery, worked great. as I had it out I checked every wire to see if anything was shorting it out... nothing. Put furnace back in and I used a 6 ft 14 GA wire hooked on the hot wire from the RV battery and on the other end I had a alligator clamp hooked to the red wire on the furnace.. The common wire I did the same way. Hooked the 2 blue wires together and it worked fine..Put the furnace back in and hooked it up the way it should be..Turn on ..blows the fuse. Put the 6 ft jumper with the alligator clamp on one end to the hot from RV battery and the clamp on the red wire to the furnace,,,turn on works fine..My question is why will it run right with the alligator clamp jumper wire and without it it blows fuses. I also tried a 6ft piece of wire and wired nut one end to the 12v RV source and the other end wired nut to the red wire from furnace..and it blew the fuse.. To help me from having to take another crazy pill what does the china made cheap alligator clamp have to do with this . Thanks for any help and My wife will greatly thank you Ed Edwards