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