On our 2017 (not the same model) we were told by Keystone that the wiring for a thermostat was behind the controler for the vent fan we would replace with the AC unit. We took the fan controler off the wall and the thermostat wire was right there and that thermostat then controls the 3rd AC. If you have (In Command) and just need a sensor I'm not sure, but it could be in the same place.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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