David,
You will just have to wait for a real expert. These queries seem to me like a whole bunch of experts standing around staring into the engine bay of a vehicle broken down on a club run. Sooner or later someone will walk up who has actually had that problem themselves (or is a geniune expert) and presto problem solved.
It is still a bit of fun to throw in some experience:
"No generator? Have you tried cleaning the windscreen?"
There are a few good fault tracing ideas above from the guys on this problem. It may not be immediately useful but there is always a little bit to learn from everyone's idea that's what makes clubs and the MLU forum good to belong to. You certainly contribute common sense (except for DUKW wheels on a Morris van!) on a regular basis.
Lang
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