Quote:
Originally Posted by jb1911
My coach has switches near the exit door over the sink that turn the black and grey tank heaters on and off. I assume they work off the house batteries so you can drive down a frozen road on the way south. Is there any way to tell if they are working or not?
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Doesn't really matter which batteries it works off of while you're driving: If your charging system is working properly the alternator will charge both systems.
You could see if they are warm, but the outside temps have to be cold enough for them to turn on (I think they switch on below 40F).