Just another thought, how old are the electrics?the neighbours and I all found the electrics on Triumphs are shit and replaced ours. I had no end of problems with the electrics on the Bonnie until I ditched the whole loom and got a new one and went to electronic ignition. Best thing for it ever. Every one goes on about Lucas electrics being rubbish, but I read a book that had the letters from Lucas, to Triumph, telling them that the components they were buying weren't up to motorcycle spec and they needed to buy heavier duty parts, designed for bikes. The tight ass management at Triumph didn't want to spend the money so we ended up with the cheaper, inferior electrics.