[Nadroj]

I would like to understand how the AC regulator is connected to the bike's wiring.
It evidently has 3 terminals - two wires and a metal mounting tag to be grounded to earth.
I don't have a good enough drawing of a wiring diagram to fathom the circuit connections.
I would be very pleased if somebody could draw a simplified version, with just the needed dip switch instead of the multi-purpose switch box.

[AzCal Retred]

A minimalist sketch, hope this helps.

[Nadroj]

Thanks for that. It is clearer how it connects up.

What's the significance of the top-left detail, which shows different coloured wires for the dip-switch compared to the main drawing?

The AC regulator I have has a blue and brown wire, rather than an amber and yellow/red shown in some diagrams. I wonder why.

Do we know what goes on in the alternator?
Anything earthed within it?

Non fiction?

[AzCal Retred]

Where are you? What bike do you have? What are you using for electrical diagram information? What's your level of repair experience/training? Hitchcocks has downloadable manuals. The Snidal manual is the Gold Standard. This diagramme is home made for a minimalist motorcycle electrical device application. Wiring color codes seem to change between models, years & geography. I assume you have an AC headlight & tail light?

1) Top left detail? Just the color code of the "universal" switches I used.

2) The AC regulator is an alternating current device, so if it is connected across the alternator AC output leads that should be all there is to it. ARE YOU CERTAIN that's what you are looking at? Do you have pictures to post of the devices in question?

3) I have not seen a grounded alternator, where a coil output lead is deliberately grounded inside the cases.

[Nadroj]

Thanks for the response. i'm in Australia.
I have this device.
I hope to install it with a normal, permanent magnet alternator with floating coils (not earthed).
There's no reason an alternator couldn't have a grounded connection within it. Some have been like that.
The grounded connection in the AC regulator is a puzzling feature.
But I'm no expert.
The manuals on Hitchcock site shed a little more light.

[AzCal Retred]

Sounds like you're a student of electricity. What bike are you riding?

[Adrian II]

Hitchcocks' on-line manual has the wiring diagram for the AC headlight models These only show the TWO wires connecting to the AC regulator, the metal mounting tag seems to be just that, not earthed at all, and there is no symbol in the schematic to indicate that is is. You have a yellow wire which is the AC feed and the amber wire which is the AC return, this is used INSTEAD OF an earth/ground wire for the return current from the headlamp and the main beam indicator light. Wiring diagram on page 70 here.

https://accessories.hitchcocksmotorcycles.com/core/media/media.nl?id=238185&c=1062795&h=e4dc43de7234f68e6f0e&_xt=.pdf

With the 4 wire alternators you have two wires going to the reg/rectifier the other two going to the AC regulator, but the alternator stator itself is simply bolted to the inner chain case, surely no need for any separate earth, and if there was one to any of the stator windings, wouldn't something be shorting out???

A.

[AzCal Retred]

On an AC coil you can "Earth", "Neutral" or ground one end. Any other coil that shares the same phasing (instantaneous polarity) can likewise be grounded. You could then use the paralleled outputs of the in-phase ungrounded ends as 1/2 of the circuit, the cases, interconnecting bolts and frame become the other power carrying conductor.  If you accidentally ground the opposite polarity end of the coil you'll create a dead short and let out the smoke.

The Bullet only grounds the (-) negative battery lead, not the AC system. This makes life simpler as they aren't fighting possible AC induction effects onto the DC components of anything else connected electrically to the frame.

You can absolutely use the chassis & cases as 1/2 of the AC circuit, but you might unintentionally cause odd issues with the DC side. That's why Enfield didn't set it up that way.

Utility power systems routinely ground their transformers & generator coils to earth to create a common ground plane, i.e. a common voltage reference for the system.  Fault current is the only normal "flow" expected over these, there are dedicated conductors for power flow and even a dedicated "Neutral" current conductor. The normal home service entrance supplies single phase 120/240 to the breaker box. These come from a pole top transformer with a 13,800V or 4,160V primary to center tapped 240/120 secondary . At the home's service entrance, the pole top "neutral" conductor is connected to the home's ground rod. Voltage between this neutral and either of the "phase" (normally black & red) conductors is 120VAC. Voltage Phase to Phase is 240VAC. That spot at the service entrance is the only location that neutral and ground interconnect. The house ground wires are a safety feature. The neutral is a dedicated conductor with a 0 volts to ground potential because it is bonded to ground and cannot be otherwise. Either phase conductor will have 120V to ground or neutral anywhere in the home and of course 240 V to the other phase.

[Nadroj]

Sounds like you're a student of electricity. What bike are you riding?

Not a student, just a biker who likes to tinker.
I have various Japanese, British and Euro bikes but no RE at present.
They are all pretty old.
Some currently made parts are useful to keep the defunct brands going.
Indian bits are particularly interesting.
I hope to install the Swiss AC regulator to a Ducati with no battery.

[AzCal Retred]

Is the Ducati running? Which model & year is it? The coil output should be similar in voltage & current to the Bullet values. Is it a 6V or 12V system? Bullet alternators are in the 60W-100W range, single phase. Is the Ducati the same? The reg/rec unit seems to be the same part across the 1999 DC to AC headlight transition, so there is some reserve capacity in their parts.

The AC regulator seems to be able to run 60W headlamps, based on empirical data. So it can reliably bypass at least 60 VA of coil output or else it would cook off if the headlamp filament blew. Tell us more about what you are doing. What did the "Swiss" AC regulator cost? Are you playing with a $5 0r a $60 part?
Hitchcocks ; PART No. 143777 ; REGULATOR FOR HEADLAMP, ACDC, AFTER 06/99 (FROM 9B 58861F) £20.90
Let us know what's happening, OK?

[Nadroj]

Hitchcocks' on-line manual has the wiring diagram for the AC headlight models These only show the TWO wires connecting to the AC regulator, the metal mounting tag seems to be just that, not earthed at all, and there is no symbol in the schematic to indicate that is is.

Yes, thanks I did see that manual and the wiring drawings.
Pete Snidal's version on his page 156 has an added resistor.
I don't see it in other diagrams. Anyone know what it's for?

Some diagrams show on/off switch for lights, others "always on".
I gather that's for different markets.

An earth terminal is not shown in the manuals I've seen, but the part itself has stampings on the metal mount tag that seem to suggest an earth. See the photo I attached earlier.

[AzCal Retred]

It might be a voltage stabilizing resistor for lights off operation to keep the coil output from going too high, but the AC reg should do that. Like you I don't see it in any other schematic. If it exists, either it"s not shown or built into the left hand switch.
Always "on" is a valid for LED application. LED's that are polarity protected should work fine in that application. What Ducati are you adapting these parts to? 

[Nadroj]

Is the Ducati running? Which model & year is it? The coil output should be similar in voltage & current to the Bullet values. Is it a 6V or 12V system? Bullet alternators are in the 60W-100W range, single phase. Is the Ducati the same? The reg/rec unit seems to be the same part across the 1999 DC to AC headlight transition, so there is some reserve capacity in their parts.

The AC regulator seems to be able to run 60W headlamps, based on empirical data. So it can reliably bypass at least 60 VA of coil output or else it would cook off if the headlamp filament blew. Tell us more about what you are doing. What did the "Swiss" AC regulator cost? Are you playing with a $5 0r a $60 part?
Hitchcocks ; PART No. 143777 ; REGULATOR FOR HEADLAMP, ACDC, AFTER 06/99 (FROM 9B 58861F) £20.90
Let us know what's happening, OK?

My 1973 Ducati single is fine but could have the electrics simplified hopefully.
Conversion from 6V to 12V is simple on these bikes as it has a centre-tapped full wave design. I just disconnected the centre wire.
The AC reg I bought for lights, horn etc:
https://www.ebay.com.au/itm/HEADLAMP-12-Volt-AC-DC-REGULATOR-FOR-ROYAL-ENFIELD-PART-NO-143777/132827990316?hash=item1eed2a492c:g:6h0AAOSwarlb2ZNy

I also converted the alternator to be able to drive a CDI ignition, using scooter parts from India.

[AzCal Retred]

Not sure the horn vibrator coil will drive on AC, but a diode bridge should take care of that.

Well done on the  CDI! - ACR -

[Nadroj]

Good idea to have a diode for the horn, thanks.

Can Pete Snidal be contacted?