Hi everyone and good news on my dynamo problem, the young guy at the local auto electrics put the dynamo and control box on his "old" test rig and after adjusting the "cut-out" all was good. I have just come back from there after he showed me the whole thing on the test rig and it is good to know a young guy knows about old stuff like this.
, Will put it back on the C8 in the morning.