opnspaces wrote:
I find it hard to believe that the tow vehicle differentiates between the trailer battery and the truck battery. My guess is the two batteries wires are just tied together at some point and the computer sees the two as one big battery.
One easy way to find out. plug the 7 way umbilical into the truck and start the truck up. Then go into the trailer and see if the interior lights come on. If the lights come on then the refrigerator should work on gas.
It is connected in the way you imply but the truck battery is connected to the alternator with a short run of heavy gauge wire that can handle substantial amps.
The trailer wiring is a longer run of small gauge wire with typically poor connections, so sending the amps to the fridge becomes problematic.
PS: most fridges pull somewhere around 150-250watts...that's 13-22amps at 12v.
