HI All,
The dyno's I exploded were 6 volt items,
I have used 6 volt ones with 12 volt regulators but with standard drive ratios, these needed driving harder to mantain charge, There were no fancy belt kits back then

On my own SR I have been using a Podronics reg for the last 9/10 years no worries. Bob Kizer who designed the Podronics reg made different ones for either a 6v converting to 12 or a 12v wound dyno, I believe they have different field current limiting set ups
It was probably my own doing that buggered the dyno

I may have had a 20w pilot bulb going with the H4 headlamp bulb

I have done some work on Vinnies that have Allton alternators fitted, on "normal" riding the alternators are not spinning fast enough to keep up the charge, if coil ignition and electric leg are fitted
No one has come uup with a faster drive for the 3 phase Alternators on the vinnies, apparently the single phase ones perform better at low revs?? buts thats an expensive experiment

A suggestion has been to use the sidecar gearing on the rear wheel so the motor is spinning faster ???? ????
Cheers
John O R