> Ordinarily the fridge is then connected straight to the aux. battery --
but
> personally I would consider retaining the fridge relay and using its
output
> to drive the charging relay.  This means that the fridge still won't run
on
> DC unless the motor is running, but it also means that you won't come back
> in a few hours and find the aux battery flat b/c you forgot to shift the
> fridge to gas.  Your choice.

Very true. However, I have found it very convenient to not have to get in
the back and start the fridge on propane every time I want to shut the
engine off. With an Optima deep cycle battery I won't even bother with
propane for a 2 hour stop! Very nice and the food stays cold even when I
forget about switching to propane... and the draw down is not harmful to an
Optima.

Bill