Peter, I had a similar issue when an indicator bulb fitting on Rosie came loose and blew a fuse, this screwed the charging circuit and the fuel gauge and voltmeter did not work, if ignition light is dim then it's related to this I suspect. You may have a bad connection on the low tension side of the ignition circuit or failed circuitry in the alternator. Suggest you take the connecting block off the alternator and ensure all are clean and good connections, and try again. Then check other connections on this circuit. It's worth a try.
