Hello. I have a 2000 coach with an electric cube heater on the driver side of the plumbing bay near the Headhunter water pump. It is controlled by a mechanical thermostat on the passenger side of the same bay. it stopped working (no power on outlet)
I thought it was the thermostat so I bought a new mechanical one and when I took out the old one to measure the line voltage I didn't have power in thermostat box. there are two wires...I thought one was incoming hot and the other was going across the bay to the switched outlet.
I have a 110v breaker in back labelled "compt heater" which was on and I measured and it has voltage on it.
so, what am I missing?
either this is wired in a way I don't understand or I have something broken in a hidden location between the rear ac breaker and the thermostat box
(11-13-2025, 05:12 AM)Jack Houpe Wrote: Good morning Don and welcome to the group. Is the plug that the heater is plugged into a GFI plug? GFI's are problematic so that would be my guess.
Thanks Jack.
this is a 2000 and the outlet is just a metal box. the plug for the water pump comes out of it and the heater plugs into it.
my real issue is this box on the passenger side. this is where the mechanical thermostat that controlled the heater was mounted. there are two wires coming into the box. I thought one would be hot and the other would go to the heater outlet. I measured and neither wire is hot even though I have a breaker in the back labelled "compt heat" and it is working
I used to be able to adjust this thermostat to turn heater on/off so there must have been a hot wire coming into it???
I believe that's a series-wired switch; this is where all the thermostat does is interrupt the power (hot wire) to the termination point, which is your heater. The only time you would read a difference of potential is if you had a load on the other end where the heater is. If you just wire those two together, it should provide power to the heater. In some cases that switch will activate a relay that would provide power to the load via a low voltage source.
the plug for the water pump comes out of it and the heater plugs into it.
I'm not picturing this in my head. Both water pump and heater on the same plug?
Hmmmmmmm, the discoloration on the wire may be indicative of a high resistance/high amperage draw which could have tripped a breaker. I know you said you have checked the breaker.
At this point, you may have to check the continuity of wiring.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home )
the pig tail plug for the water pump comes out of the same outlet box but is separately wired
it seems super simple. two wires come into thermostat box...one hot and one switched to heater. I thought it would be 110v but I measured AC with my meter and didn't see any voltage.
I am wondering if the wires in the thermostat box are 12v and feed a relay on the driver side that controls the heater outlet.
I am like Jack, I don’t quite follow your description.
I think you are describing a 120V junction box that has both a pigtail for the water pump, and wiring that goes to the compartment heater thermostat. If that is not correct, could you draw a simple wiring sketch, take a pic of the sketch, and post it?
My understanding of what you describe doesn’t match having a separate breaker for compartment heat? And another breaker for the water pump.
Richard and Rhonda Entrekin
95 Newell, 390 Ex caretaker
99 Newell, 512 Ex caretaker
07 Prevost Marathon, 1025
Maverick Hybrid Toad
Inverness, FL (when we're home )
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