My '87 has it too.  The useful results of my own inquiry were:
 1. VW knows about the problem, has a service bulletin on it, and sells a wiring harness "patch" for $166.00
 2. Someone has devised a homegrown repair that uses a order of magnitude cheaper electronic part being soldered in that you can get at any Radio Shack.  There's even a web page with instructions and photographs, unfortunatley I'm on a library computer and don't have access to my links, so I can't give it to you.
  Just knowing I CAN fix it has been enough for me so far.  I'll get around to it when it irritates me enough.

The Trundler
'82 Westy
'87 Westy

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