enblethen wrote:
A standard diode like this would work.
Diode
That is actually the one I was looking at. My concern was that if, by some chance, there was a large differential between the towed voltage and the RV voltage if it would handle the current surge that could occur. Probably a foolish concern.
There is a relatively inexpensive device on the market that will compare the voltage between the house and chassis batteries. It allows spill over to the chassis batteries if they drop too low while you are plugged in to a power source. I don't remember what it is called.
