Topic: S65 lighting coil

[Dpcm91]

Old problem, insufficient lighting power. The S65 has a half wave selenium rectifier and no regulator. It appears that the lighting coil is half wave also based on the fact that the end of the winding (daytime shunted and nighttime full coil) are grounded to frame. Based on schematic on S90 its coils don’t go to ground. Daytime full wave coil wire to bridge rectifier with common to rectifier, nighttime full wave coils to switch for lights and “excess” 🤣 to rectifier. Am I correct in my observation? If so can the half wave lighting coil be made a full wave by clipping the ground and rerouting to a full wave rectifier/regulator like the S90 setup? Anyone doing this conversion? YouTube video shows a GY?? Scooter engine with half wave alternator converted to full wave by clipping grounded coil and rerouting to new full wave rectifier with regulator. Full wave is more efficient than half wave!

[bryanj]

I have no experience of the bike you are asking about all i can tell you about is the old triumph lucas system that had six coils
1 daytime running 2 coils giving power other 4 sharted together to reduce the output of the 2
2 side light on 2 coils giving power other 4 open circuit so not producing back emf thus the 2 coils give slightly more power
3 nightime running all six coils wired to give output governed by engine speed.
This was all done with a complicated, and expensive, lighting switch and a permag rotor