[Krolroger]

Thank you chaps.

The motor has its own 27V winding on the transformer. (Schematic attached).

Have to say I am slightly puzzled by some of the motor side voltage readings I am getting, particularly the 15 and 20V~ across the run cap, which are way off. (I take it these voltages are not referenced to ground).

When I changed the belts, the motor was free running. I will be able to get a sense of whether there is a mechanical glitch by rotating the flywheel.

I will check for voltage drops etc and report back.

Thanks.