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I have two types of Indian Electronic stators.

A) On one of them, the 4 lighting coils are wired in series, the yellow wire at one end and earthed at the other end. Presume this is for the AC wiring system without battery. Is this correct?

B) On another, the 4 lighting coils are wired in series and a yellow wire at both ends. None of the coils are earthed. I guess both yellow wires go to the rectifier to convert the AC to DC. Presume this is the wiring system for the DC system with battery. Is this correct?

I also have a Ducati stator from an AF type light flywheel DC system. In this case, the 4 lighting coils are double wired in series with 2 yellow wires at one end connected to each of the double wires and a red wire at the other end connected to both double wires. Can anybody tell me what is the point of this double wiring and how this is wired into the regulator. Seems that AF have not sold this DC system for 20 years and so don't appear to have a wiring diagram. Is this a 50 Watt system? Grateful for any comments please.

A) Classic AC electronic stator,you can use a battery for trickle charging only.
B) DC stator,connect the two yellows at 1 and 3,it doesn't matter which way,then everything from the main loom must be common with the zener (apart from ignition green).
You can use a battery or a capacitor.

Is the Ducati stator electronic or points?
As always a pic can be very helpful

The Ducati stator is electronic.

Is it the one from electronic GP?

Not sure of its origins but AF used to sell a DC system with their lightened flywheel with this Ducati stator.

I have a Ducati stator from an AF type light flywheel DC system. In this case, the 4 lighting coils are double wired in series with 2 yellow wires at one end connected to each of the double wires and a red wire at the other end connected to both double wires. Can anybody tell me what is the point of this double wiring and how this is wired into the regulator. Seems that AF have not sold this DC system for 20 years and so don't appear to have a wiring diagram. Is this a 50 Watt system? Grateful for any comments please.

I can imagine the output power is dictated by the number of turns and the wire gauge per coil but not sure what double wiring will achieve.

salient wrote:I have a Ducati stator from an AF type light flywheel DC system. In this case, the 4 lighting coils are double wired in series with 2 yellow wires at one end connected to each of the double wires and a red wire at the other end connected to both double wires. Can anybody tell me what is the point of this double wiring and how this is wired into the regulator. Seems that AF have not sold this DC system for 20 years and so don't appear to have a wiring diagram. Is this a 50 Watt system? Grateful for any comments please.

I can imagine the output power is dictated by the number of turns and the wire gauge per coil but not sure what double wiring will achieve.

Early AF remade Ducati electronic stators were wired this way, they were produced as a dc version that ran with the original AF light weight flywheel that Ray Kemp had made. These were never as popular as the ac version that Ray had made.

The wiring meant they had a couple of advantages over the four standard coils of the old 12v dc conversions. They also used a similar rectifier to the motoplat system, but that's possibly because they were wired almost identical to a dc motoplat stator.
Two yellows ac feeds from one end of each of the four double wound coils, then a red wire which is a shared connection from the two other ends of the four double wound lighting coils.
Each of the yellows supplies an ac feed to the rectifier. If you look at these lighting coils you can see they are also very lightly wound when compared to any Indian ac stator but they produce pleanty of power.

Thanks Captain,
Where does the red wire go which is a shared connection from the two other ends of the four double wound lighting coil? Do you have access to a wiring diagram? On each pole, are there 2 separate windings wound on top of each other? Any idea how much power this stator produces?

salient wrote:Thanks Captain,
Where does the red wire go which is a shared connection from the two other ends of the four double wound lighting coil? Do you have access to a wiring diagram? On each pole, are there 2 separate windings wound on top of each other? Any idea how much power this stator produces?

Yes on each coil two seperate windings, each set of coils joined in series, giving two series wound circuits the red is a common and connects at the rectifier. It's the return for the yellows.

Not sure what they were supposed to output but I measured my one and that worked out at around 65 watts peak. It wouldn't supply that power at all revs only at high revs.

It needed to run above 4500 rpm to maintain a charged battery with the lights on. 35 watt front 5 watt tail.
I sent you a PM.

I need to get my head round these stator wire issues. When you have a series of lighting coils wired in series and at each end there is a yellow wire, I can see that both these yellows would go to both AC inputs of a 4 bridge rectifier. Presume both yellows will be out of phase.
But when as in above AF DC case there are 2 yellows at one end and a red at the other, I get confused as you say all 3 wires go to rectifier. Both yellows will be in same phase so should I connect them together and then the combined yellow pair forms one input to the AC inputs of a 4 bridge rectifier and the red the other AC input?

salient wrote:I need to get my head round these stator wire issues. When you have a series of lighting coils wired in series and at each end there is a yellow wire, I can see that both these yellows would go to both AC inputs of a 4 bridge rectifier. Presume both yellows will be out of phase.
But when as in above AF DC case there are 2 yellows at one end and a red at the other, I get confused as you say all 3 wires go to rectifier. Both yellows will be in same phase so should I connect them together and then the combined yellow pair forms one input to the AC inputs of a 4 bridge rectifier and the red the other AC input?

Multimeter the connections, you will see that all three lighting wires are connected, the resistance between each wire will show that red is at the end of each yellow the resistance from yellow to yellow will be double the resistance of either of the yellow wires back to red.

If you were to undo the connections and unwind the wires you would see that each set of four windings are opposit to the other in ther connections, each yellow gives the opposite AC sine wave.

It might be hard to follow but it's how it's done.

OK so where do the 3 wires feed into the rectifier?

salient wrote:OK so where do the 3 wires feed into the rectifier?

You don't have the original rectifier ?

I do have it but want to know how it works compared to a 4 bridge set up.