Hi folks...  I (also) have a 1982 air cooled, fuel injected
transporter van.

For a couple of years now the battery will go flat after a few days.
I inserted a multimeter between the battery and one lead, removed all
fuses and made sure nothing else was powered (it has no clock for
instance).

Sure enough, there was still a current draw - about 130mA.  So back to
the engine bay I went...  I unplugged every plug, wire & harness one
at a time.  The culprit was in the last one I unplugged - (amazing how
that always happens to me, how about anyone else?)  : )

Anyway - the fault is in the Jetronic fuel injection box.  I *think*
it's an LH Jetronic, since the injectors are powered, so it can't be
K-Jet.  Anyway, I removed the cable from injection box socket, no
current draw.  Replace, 130mA drain again.

I don't suppose this is a common fault, or anyone would know what
faulty component I should be looking for?

Allan