Is tow vehicle's battery and trailer's isolated from each?

Thanks to all. I don't know if I have the towing relay. Will look tomorrow.

Nice to know the battery will likely charge on the road.

So I guess the refrigerator pulls to much power to run off the battery when on the road. Per our salesman it's either propane or shore power and on the road it's propane.

ScottG wrote:
On your FOrd it is indeed separate and they are only connected together when the key is on.
Dodge and GM are always connected together.
FWIW, I've had it both ways and I actually prefer them to be tied together.

Actually, it depends...
Some vehicles are built so that the trailer power lead is only energized with the ignition ON.
Some are not.
Of those that are not, some have been fitted with aftermarket parts so that the trailer power lead is only on when the ignition is ON (like my old '94 Dodge 3500).
You won't know exactly what you have until you test it.
Good luck.

+1

Yes on Fords, the batteries are only connected when the switch is in the on position. And yes. If you have the towing package relay installed on your Ford. It in fact charges the trailer battery as you drive down the road.

As to your electric trailer jack. If your trailer battery is dead, all you have to do to power the jack. Is connect the 7 pin, and turn your truck key to on. Then the truck will send power to the trailer, and power every thing in it, that runs off battery. It's best to have the ruck running when you do that.

with the right elece. package tow vechile will charge rv battery

On your FOrd it is indeed separate and they are only connected together when the key is on.
Dodge and GM are always connected together.
FWIW, I've had it both ways and I actually prefer them to be tied together.