Very odd.
Do you have a digital thermostat? (or Even the analog one). If so does it display the temp without AC or Genny power? Perhaps it not getting 12v power to activate fan?
When you move the temp up or down (while on HEAT) does it "click" (without AC or Genny power on)? If not - check wiring behind thermo.
Just an Idea.
If I think of any others I will thow them on the wall to see if they stick.
I bet its something simple but I cant think of anything else unless it need more 12v juice than your providing (I would get a cheap mutimeter if I was you- Im just learning how to use mine..... but its becoming a valulable tool for me).
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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