going to try to answer everyone at once.
Thanks for the help by the way.. It's all new to me.
I disconnect both batteries.. Then measured the volts to the wiring in at the batteries.. 0.00 volts.
I put one battery on a trickle charger. I only have a trickle charger, my big charger died on me.
When the battery on the trickle charger got to 12.6 volts, I threw it back in the camper.
Wiring is as follows
Neg to Neg bridge
Pos to Pos Bridge
Postive from camper to pos on one battery
Neg from camper to Neg on the other battery
Went inside, battery monitor read 2/3 battery life.
Fridge is working on AC now.
Forgot to check the air conditioning and the furnace, but I'm going to guess they are both working now.
I left the trickle charger on the batteries in the camper for the night.
Yes they are deffinitely 12 volt batteries.. I'm new to campers, not to batteries!