Well, the good news is the charging fault has been solved! I got an auto electrician to come out this morning to have a look. After dusting off his knowledge of dynamo systems he then had a poke around. Battery feed seemed OK. We then fired it up briefly, lots of power from the dynamo (up to 50v), so we know that's working. We were just discussing taking the regulator off to bench test it when he noticed the main battery feed. It wasn't massively tight, had scorch marks and when he took it off, it wasn't that clean and the sheathing covering the connector fastening was partly covering the connector surface. Although I fitted the new regulator (it must confess to not noticing and I don't think the scorching is new) it must have been like this when in service (maybe the old regulator was more tolerant than the solid state version?). Anyhows, with the connector cleaned with sand paper and the sheathing cut back, it was popped back on. Started up and warmed up to working temperature - fine, no dramas at all! Charges well with peak of just under 14.5 v coming out of it. Charge light goes out fully and stays out, and of course, it runs sweet as a nut! The verdict - due to the poor main 'B' connection, as it ran, the terminal was getting warmer (I had noticed the bottom of the regulator getting warm) until it was so hot and the resistance so high, nothing was passing through it so it was pretty much running on the battery.
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