Electrical fault

Could be the battery itself breaking down, or more likely as said, connection problem.
If you haven't got battery discharge tester, most places will test it for free....or if you are anywhere near Christchurch, I will.

 

Are you getting a constant voltage to battery with engine running? Was thinking rectifier/regulator?

 

This sounds incredibly similar to my problem!

 

Is the loom free to move at the headstock read somewhere this was causing problems on some models

 

Definitely sounds like a earth type problem.

 

As i said in the other post find and clean all the earth points.

 

Tyse
Think the peeps are right here you got a faulty earth. Check for corrosion and loose wires especially around your battery and ignition switch.
Regards
Joe.

 

Hi there!
I read about a bike with a problem VERY much the same and turned out to be a rec/reg. The windings had a problem.
His was a honda but the systems were the same. He had his re-wound and viola, up and running.
Worth a look.