RE: Battery Drain
I can almost beat that Jim (but not quite)
After the engine was replaced in my '85 the battery would go dead
overnight, but it was intermittent.
One item kept popping from the back of my mind.  When I got the van
back from the shop that did the work, which included a new radiator,
the heat control was all the way to the left.  I knew this could be a
problem with the heater since I had a bent heater control cable.  I
dealt with the problem by disconnecting the battery if I was going to
be parked overnight.  I was suspecting something shorting under the
dash, pushed around by the heater cable.  On the night that I totaled
the '85, the battery had been fine for a week or two, no drain.  (I
could hear a relay click under the drivers seat when connecting the
battery if the short was there).  That night I had to turn on the
heater and pulled the battery for the event I was at.  When I
connected it to leave, 'click', the short was there.
Ah ha, suspicions confirmed, now I know where to look under the dash
for the short, right around the area that the heater control cable
passed.  But, the Westy was totalled on the way home.  So I never had
the pleasure of looking for the problem and saying 'Eureka! I found
it!'