egarant wrote:
When I look at the 7 pin wiring diagram, if I disconnect the 12 volt feed wire from either the umbilical cord or the truck receptacle that should isolate the batteries.
Are you sure it is "hot at all times" ?
egarant wrote:
Of course I will not be able to charge the house batteries when underway, but I have full solar for the purpose.
You are probably not doing a good job charging you house battery anyway. There is quite a lit of wire from the fuse box to your house battery and a couple of connectors. This all adds up to voltage drop. meaning even when you are driving down the road, you are likely NOT getting enough voltage to properly charge the battery.
Go ahead and disconnect it.
If you really want to charge you house battery while you are driving, get a DC input battery charger
(YES, they do exist; typically will accept 10V input) OR run a 1000W sine wave inverter directly off of the vehicle battery with very short 4 gauge or even 2 gauge wire and plug it into your converter/charger. A 500W inverter would run a battery maintainer and you could drop down to 10 gauge wire.