3 Phase Stator wiring

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wheelz

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Apr 21, 2022
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My single phase stator went belly up. Thinking I might want 3 phase down the road if I ever add electric start. 1974 850 MK2, right now I have a single phase podtronics regulator and older electronic ignition ( probably Boyer, but not sure) that works fine, not a lot of load on this bike. Would I just use 2 of the stator phases and safe off the third?

Thanks
 
The original single phase setup was a full-wave rectifier (four diodes) and a single zener diode regulator. In my experience these were stone-axe reliable but for the self-destructing early rotors. The MKIII had a 180 watt setup with again a full wave rectifier except that two zeners were used as half the full-wave recitfier and the finned unit up under the tank had only two of the 4 diodes, the other two being the zeners. Looking at the wiring diagram you don't see the full-wave aspect at first until you realize the the zeners are half the rectifier. With the three-phase Interpol setup a six-diode, finned rectifier is used and the two zeners on the z-plates just regulate the voltage. Two zeners are required to handle the extra current. Don't leave the third phase disconnected using only two wires. The voltage in the unloaded phase will go quite high and maybe back-feed into the other two phases. You could just use a MkIII single-phase stator at 180 watts and add a zener. That would be the simplest. What is the benefit of the Podtronics regulator?
 
Just swap out to a three phase reg/rec and enjoy the benefits of three phase alt output. I did the lucas three phase stator and TriSpark mosfet RR recently and my charge warning light has never been happier.
 
I ordered the 3 Phase Stator and a Podtronics 3 Phase regulator. The original regulator is a Tympanium, could be 20 years old. I get the allure to keep it all original, but I prefer the modern electronics in this case. I’ll probably keep the electrical original on my 71 B50 project. Thanks to all for the input.
 
My '74 Aermacchi / Sprint 350 has a Powerdynamo alternator in it, and the tiny regulator in the kit leaked so badly the battery is dead in a week of sitting. After a lot of research, I came across these Shindengen regulators, with a long history of service and importantly, no leakage and battery drain while sitting. I rewired my entire charging system and it's sat now for a month- the battery voltage is still at 12.5v.
This regulator works with all 2- and 3-wire systems. My Aermacchi is a 2-wire and charges at 14.8vdc. I expect I'll put the same with the 3 phase upgrade in my Commando.

 
Podtronics will work fine with a Boyer, not so much with a tri-spark. You made the right move, why pay for a 3 phase stator and not get the benefit.
 
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