I had the no start demon in my 70 westy for a long time and it is still there
very once in a while.
What I had to do was to short htr connection between the solenoid & the hot
terminal on the starter. After a while this gets boring when you are wearing
work clothes, I then decided that the starter switch was on the blink but
this is difficult to replace. My solution was to wire a solemoid switch in
parrallel to the ignition starter. This has worked great for a long time and
it is obvious that this is getting wonky. So I now have to turn the
conventional starter switch (nothing seems to happen) and then toggle the
parrallel circuit and it goes fine. This fix has been in place for about 18
months and just now noth circuits together sometimes do not work. I am
thinking of putting in a heavy duty relay for the starter solenoid. I believe
that many later model vehicles have such relays and did VW go to such a thing
for the Vanagons & EV's?? If so can someone let me know what the specs for
the relay are..

sam williams 
70 westy Yukon Bound