Just got back from a 4 day trip and found out that the electronic thermostat that I bought didn't work. (I gambled). It's a small digital dial made by Honeywell that can work with multiple types of house systems. The unit gets its power from the thermostat wires. There's just two wires needed in a house that uses the 10-volt transformer in line with the thermostat.
In my MH, the two wires are delivering 12V
DC to the thermostat and when the contacts close in the thermostat (calling for heat), you can see where that's going, right? The thermostat unit loses it's power supply, and it goes into a cycle where the furnace starts and stops over and over again.
I gave up trying to figure a way to make it work in a DC system. The contacts (electronic) inside the thermostat unit must allow one half-cycle of the 60 HZ AC to power the unit while the opposite half-cycle is shorted out, (acting like a switch)...maybe.
I needed a digital thermostat at home anyway to replace the old mechanical one so the one I bought should work at home.
I'm going to shop around for a another digital thermostat for the MH and see if I can make one of the battery powered digitals work...because I want a digital thermostat now. Honeywell makes a reliable mercury type, but having a digital makes it much nicer because I can set the number on it and not have to experiment to get a good temperature.
I'll let you know what type and how it works when I'm done.