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6V to 12V #228917
12/20/08 1:13 pm
12/20/08 1:13 pm
Joined: Dec 2008
Posts: 3
SA, Australia
3
3TA1962 Offline OP
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3TA1962  Offline OP
BritBike Forum member
3

Joined: Dec 2008
Posts: 3
SA, Australia
To convert an 3 wire alternator (Triumph 3TA)from 6v to 12v, 2 wires have to be joined. My bike has Green/yellow, blue & brown wires from the alternator. Which 2 are joined or doesn't it matter?

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Re: 6V to 12V [Re: 3TA1962] #228945
12/20/08 5:37 pm
12/20/08 5:37 pm
Joined: Apr 2006
Posts: 1,708
Virginia, USA
SBoyd Offline
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SBoyd  Offline
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Joined: Apr 2006
Posts: 1,708
Virginia, USA
3TA welcome to the forum.

It matters a lot.

The colors that are most common on 3 wire Lucas stators are:
green/black, green/yellow, and white/green.
Since yours is a 1962 AFIK that should be the case.

In that case, it is the G/B and G/Y that are connected together.
The W/G stands alone.

I would say, double-check the colors all the way back to the open-frame stator. Maybe someone soldered on new leads.

If you can afford it, now is the time to upgrade to a new 2 wire encapsulated stator. The pattern ones are reasonable in price.

good luck
>>sb

Last edited by SBoyd; 12/20/08 6:58 pm. Reason: made mistake in colours

Stop the insanity.
Re: 6V to 12V [Re: SBoyd] #229007
12/21/08 3:10 am
12/21/08 3:10 am
Joined: Dec 2008
Posts: 3
SA, Australia
3
3TA1962 Offline OP
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3TA1962  Offline OP
BritBike Forum member
3

Joined: Dec 2008
Posts: 3
SA, Australia
SBoyd thanks for the information.

You were right, someone has soldered new leads on. So I'm still in the dark (no pun intended re Mr Lucas). Can anyone identify which correct coloured wires used to be connected to which coils. I'm trying to get out of this as cheap as possible + I like trying to fix things in this disposable world.

Thanks for any assistance.
Steve

Re: 6V to 12V [Re: 3TA1962] #229022
12/21/08 10:25 am
12/21/08 10:25 am
Joined: Aug 2001
Posts: 7,549
scotland
triton thrasher Offline
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triton thrasher  Offline
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Joined: Aug 2001
Posts: 7,549
scotland
It should be possible to work it out, presuming the 6V system is working now.

2 alternator leads go to the rectifier, don't they? and a third one goes to the light switch and is connected to one of the other two, only when the headlight is switched on. So you want the third one connected permanently to the one that the switch connects it to now. Does that make sense?

I don't think you can damage the alternator by getting it wrong (no guarantee, I'm just an internet nonentity).


Amateur Loctite enthusiast.
Re: 6V to 12V [Re: 3TA1962] #229065
12/21/08 3:51 pm
12/21/08 3:51 pm
Joined: Mar 2006
Posts: 3,771
Norfolk, UK
L.A.B. Offline
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L.A.B.  Offline
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Joined: Mar 2006
Posts: 3,771
Norfolk, UK
Originally Posted By: 3TA1962
someone has soldered new leads on. So I'm still in the dark (no pun intended re Mr Lucas). Can anyone identify which correct coloured wires used to be connected to which coils.


Alternator wire identification: http://www.classicmotorcycles.org.uk/c15/c15_alternator_wiring.htm

12V Conversion: http://www.classicmotorcycles.org.uk/c15/c15_12v_conversion.htm

Re: 6V to 12V [Re: L.A.B.] #229106
12/21/08 9:21 pm
12/21/08 9:21 pm
Joined: Dec 2008
Posts: 3
SA, Australia
3
3TA1962 Offline OP
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3TA1962  Offline OP
BritBike Forum member
3

Joined: Dec 2008
Posts: 3
SA, Australia
Thankyou all for your assistance and links.

Should be able to sort it out now

Steve


Moderated by  Alan_nc 


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