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Vintage Technical Tips & Tricks Technical and maintenance tips and links. DO NOT POST YOUR QUESTIONS HERE!! Please post questions to the general forum.

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Old 04-11-2011, 06:20 PM   #1 (permalink)
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Stator Question. Two or Three wires?

I'm a bit confused on the stator. To start off I have a 79 Bonneville T140E 750 cc. There are three wires/terminals that go from the rectifier to the alternator, as least as far as I understand. These three are colored green/black, green/white and green/yellow. I ran some tests and suspected the stator to be faulty. I took it out and then I noticed there were only two wires coming from the stator when I thought there should be three.

I bought this bike last summer and I always knew there was this extra wiring just hanging around where snap connectors are from the alternator to the harness. When I unraveled the electrical tape I saw that only two of those wires actually were connected to the alternator and the third one (the one i always noticed hanging around) didn't connect to anything? Now I know the guy told me he replaced the entire harness on the bike and what I'm trying to figure out is where that third wire is supposed to go? I thought maybe the stator was from a different bike that only used two wires and he adapted it somehow? Or is that how it's supposed to be? Because I'm looking at a picture of the stator where I was about to order mine from and noticed those only have two wires as well?

I'm really confused. Any help is surely appreciated. Thanks.
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Old 04-11-2011, 08:01 PM   #2 (permalink)
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1 or 3 phase stator

You may have to verify whether you have a single-phase (2-wire)or later 3-phase (3-wire)alternator. Did a wire break or is it a good single phase. Your regulator will need to match your stator. It gets interesting investigating repairs by the PO. I think there is some reduced charging by using 2 wires of a 3 wire stator, but I don't know about the other way 'round. If the stator is functional but wrong, replacing the rectifier/zener with solid state single phase might be an option. Sparx makes stators. Bob

Last edited by coloradobob; 04-11-2011 at 08:10 PM.
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Old 04-11-2011, 08:48 PM   #3 (permalink)
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I think I'm supposed to have a 3-phase(3 wire) alternator. This is my assumption based on the Triumph Shop Manual, the wiring diagram and the fact that there's three wires coming from the rectifier. But this current stator that I pulled out is a single-phase (2-wire). One of the wires did break where the snap connectors should be. So I have a 2 wire set up where I should have a 3 wire set up.

When you say my regulator has to match my stator, are you referring to the zener diode pack?

Here's what the shop manual says:

The alternator produces 3 phace AC, rectified to DC by a 3DS5 rectifier and voltage controlled by a 2CDP zener diode pack.
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Old 04-11-2011, 08:56 PM   #4 (permalink)
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I'm just saying that they both need to be three phase. I't doesn't make much difference in the long run if the alternator stator is incorrect or just has a broken wire. http://compare.ebay.com/like/3602986...fdbd485&itemid At least they're cheaper than when another Lucas was the only choice. http://cgi.ebay.com/ebaymotors/ws/eB...2166&viewitem=
Bob

Last edited by coloradobob; 04-11-2011 at 09:01 PM.
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Old 04-11-2011, 08:59 PM   #5 (permalink)
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Awesome. Thanks a lot for your help, man.
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