Just changed my thermostat last week to the hunter. There is plenty of wire. When the rv was built (forest river brand) the installer caulked the wires with silicone in the hole. Cut some of the caulking away, carefully pull some of the excess wire through the cut-a-way caulk. I just went ahead and snipped the wires where they were soldered to the factory installed thermostat. Make sure you disconnect the battery, turn off the AC power. When you turn the power back on , the A/C will go through its lock-out time out. May take about 3-4 Min's before the ac starts. There is a web site for the wiring diagram for the Hunter to the Coleman Mach. I installed a high/low speed switch. Works great on heat and cool. the Hunter has about a 1 1/2 to two degree differential where the original thermostat has about a six to eight degree.
Sid, Lois & HRH MISSY Terrible 2s SHIH TZU
2011 ROCKWOOD 8285 WS
2014 F-250 KING RANCH PS/SD/6R140/BFT
BOLIY PRO 3600SI GEN
DAYS CAMPED 2016 74 DAYS