John.. I have an 80 Westy and I am about to install a 2nd battery in the
compartment under the driver's seat.  I dont have a fridge (its an icebox)
but it will run the water pump for the sink and the little water level
lights on the panel below the sink.... there should be an electrical harness
that goes to all these things under the sink... that's where mine is.

Jed Thompson
Sk8487@msn.com