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alternator 6 or 12 volt

alternator 6 or 12 volt

Postby chrisf1 » Mon Dec 07, 2015 2:28 pm

Hi again everyone yet another problem how can I tell if the alternator on my bike which at the moment is in pieces is 6 or 12 volt I have it off and in my hand but cannot see any I.D. or numbers anywhere and there are no bulbs in the bike to help me in that way the battery was replaced with a 12 volt by the last owner who only had it for resale and he put a 12 volt on but as I am rebuilding I need to be sure many thanks Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Mon Dec 07, 2015 3:28 pm

How many stator wires?
What are the wire colours?
Open or encapsulated coils?
How many laminated cores inside (6 or 9) ?
What make/type is the regulator (or regulator/rectifier)?
Is there a Zener diode?

Photos?
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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue Dec 08, 2015 1:41 am

Hi LAB and thanks for your reply I am attempting to post 3 pics showing both sides and the 3 wires of which 2 are green and cream and the 3rd is either solid green or green and black and hopefully you will be able to tell me what it is many thanks again Chris
Image

Image

Image

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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue Dec 08, 2015 1:54 am

Hi again yet another item that I believe is the rectifier please confirm still got a lot to learn thanks Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Tue Dec 08, 2015 1:55 am

chrisf1 wrote:I am attempting to post 3 pics showing both sides and the 3 wires of which 2 are green and cream and the 3rd is either solid green or green and black and hopefully you will be able to tell me what it is many thanks again Chris


An extremely ancient 3-wire, single phase RM?? stator-that's what it is. :)

Those "green and cream" wires are in fact green/yellow, and green/white! The other being a green/black.

If the green/yellow and green/white wires are connected together ahead of the rectifier then it should operate as a 12V stator.

Information on how to use it as a 6V stator can be given, if necessary.

(Awaiting correct rectifier photo)
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Re: alternator 6 or 12 volt

Postby L.A.B. » Tue Dec 08, 2015 2:16 am

If you mean this item in your Photobucket album, then yes it is the normal positive earth Lucas rectifier.

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Is there a Zener diode (regulator)?
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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue Dec 08, 2015 3:19 am

Hi again I cannot see a zener diode what does it connect to and I will try again thanks I do not know if it makes any difference but at the moment it is running a distributor and coil which I intend to change for electronic ignition if possible without needing to use a battery is it possible because deciding where to put the battery is a problem, don't know how the pic went wrong but I am no techy but can get by with a spanner many thanks again Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Tue Dec 08, 2015 5:33 am

chrisf1 wrote:I cannot see a zener diode what does it connect to


If it's there, it should be connected 'somewhere' on the negative side of the battery (for positive earth) and is usually mounted either on an alloy heat-sink plate or some other substantial metal component that will dissipate heat?
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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue Dec 08, 2015 7:35 am

I think I have found it quite a bit bigger than the one shown mounted behind the headlight
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Re: alternator 6 or 12 volt

Postby L.A.B. » Tue Dec 08, 2015 7:39 am

Yes, that's it.
The circular plate is just the heat-sink.
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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue Dec 08, 2015 9:18 am

Great how do I set this up to run without a battery and electronic ignition thanks Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Tue Dec 08, 2015 10:10 am

chrisf1 wrote:Great how do I set this up to run without a battery and electronic ignition


I take it you meant without a battery but with electronic ignition?

For a points system this would involve fitting either a 2MC or similar type capacitor or replacing the regulator and Zener with a reg/rec unit containing a built-in capacitor such as the Boyer Powerbox or Podtronics Pod-4-1 Max.



Attempting to run electronic ignition could be another matter entirely and whether it worked at all (considering the ancient alternator) is likely to depend on the particular electronic ignition system.
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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue Dec 08, 2015 1:18 pm

You got it right that's exactly what I meant and thanks for all your help, when I can afford all I have to get I will no doubt need more advice fitting it but now we have a plan thanks very much Chris

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Re: alternator 6 or 12 volt

Postby Triton Thrasher » Thu Dec 10, 2015 5:41 am

Hmm. Budget for a new alternator.

And leave space for a battery.
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Re: alternator 6 or 12 volt

Postby chrisf1 » Thu Dec 10, 2015 7:59 am

Hi Triton the budget includes a lot more than alternator and battery if I can fit it, would prefer not though Chris

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