Hey all,
  One thing to consider when rousing your beastie from hibernation after a
winter:
 You may want to disconnect your batterie(s) (if you neglected to disconnect
it before putting the vehicle to sleep) when you put a charger on the
system.
 Dunno if it really makes a difference with the Vanagon, but most of the
Bosch electrical systems I've had experience with are susceptible to
possible component damage when charging the battery.  I know for certain
that you can destroy a very expensive engine management computer in Porsches
if you do not disconnect it during battery charging..
  Maybe I am "gun-shy" now, but pulling a cable is easy and it can't really
hurt much
  Don Hanson