Dynamo no go

[Dave Wortley]

I had similar problems with 5 dynamos I had rebuilt a few years ago. They would run as motors but no go when connected to my electric drill rig. I think I got about 1v on all. A few weeks later I tried them on my rig again, this time for longer and on each one the drill would come under load suddenly and wind up my hosepipe drive coupling producing 8v or so. (Can’t remember exact volts.)