I have an 89 Westy with main and auxil batteries.  I need to pull out the
stove/fridge cabinet to replace some moldy water lines (we got our westy
from a daily driver-never-go-camping type owner...), do some cleaning, and
other repairs, etc .

A few questions:

Do I need to disconnect the main battery or just the auxil (driver side) to
disconnect water pumps, fridge, etc?

Depending on that answer, anybody have any advice on if I disconnect just
the auxil battery and need to drive the van before I am finsihed working on
the fridge/etc and get it all reinstalled?

(i.e. what sort of connectivity between the main motor elect system and the
"camping" auxil system should I worry about ?...)

Thank you all,

Eric