>                  My '90 syncro westie has a voltage leak somewhere. Battery
>> goes to zero after 2 days of the camper not being driven.
>
>
That is pretty extreme.  Mine will die if not driven for a week - but
quicker if I don't charge it up well - so definitely think there is a slow
leak somewhere.

I just ordered a battery kill switch for $5 from ebay:  http://goo.gl/GSl9a

I'd really rather figure it out properly, but this will do for now.