I thought it was a dead battery, but after changing it still no joy. Tested starter relay and seemed corroded so replaced it. Have 12v at the relay, 12v at the ignition key, 12v at the white connector side of the regulator/rectifier, but when I turn the key on, no lights (neutral, oil etc) and no electric start. If I jump from the battery directly to the starter lead, it cranks and starts just fine.

Seems obviously electrical and I have tried to follow the diagrams in the manual but I’m obviously missing something, hopefully simple. Not sure what to test next for voltage or what voltages should be with key on/off etc. any suggestions are welcome.