45Brit, I too lived the Lucas "joke", ie calling that lame single poled collection of parts a generator! This on my BB34's and M20. Yes, thank goodness the magneto was a lot more reliable. Spent too many rides coming home by the light of the moon
And the advice is good wrt to the later 12volt 65a generators, it's just I like to swim upstream, I guess.
However, on the 12volt field conversion on the 32E, it is a bullet proof job and totally reliable. My 3 daily rides have racked up hundred's of thousands of miles with no failure since I did the first conversion 30 plus yrs ago.
The pluses of the conversion are
1) Only costs the price of the fields 30-50 bucks
2) Don't need to worry about doing the adaption of threads from 5/16" down to 1/4-24 as with the 65A
3) The 32E is a more robust design than the 65A, the 65A was a "hotrodded" design electrically. They decreased the gauge of the armature winding to get more windings in the slots. This created higher voltage at lower rpm's, but increased the resistance of the winding and thus the heat created in the winding. So, if you regulate the output of the genny carefully not to exceed the rated 10 amps, you're o.k. BUT, if any thing goes awry, you toast the armature. Now I'm sure the Cycle Electric genny with the integrated regulator must do that. But, if you go for a remote regulator, you can get in trouble.
So, being cheap and not wanting to spring for the CE combined unit, I just go my own way with the 32E.
I also converted a 58 Fan cooled police unit a couple of years ago with the 65A fields and have been running that on my Pan. The bonus is the extra output from that unit, conservatively 15 amps at 12 volts. Enough extra that I was able to use heated gloves on the trip to Daytona this year, what a life saver.
Anyway, I know I'm opinionated, but I do have my reasons