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Help Identify Sparx Alternator

Discussion in 'Norton Commando Motorcycles (Classic)' started by cterry66, Apr 6, 2019.

  1. cterry66


    Apr 9, 2011
    I'm restoring a 75 MK3 that hasn't run since the late 80's. Today I removed the Primary cover for a look and discovered it has a Sparx alternator stator with no id marks with a stock Lucas Rotor.
    Question is, this Sparx unit has 3 wires of which Green/Black and Green/Yellow are joined together plus a separate White/Green wire. I cant tell if someone wired these together by mistake or this is actually a 3 phase unit. It is running a Tympanium Regulator that is wired properly if in fact it is a single phase set up.
  2. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Nov 20, 2004
    How many mounting holes in the stator, 3 or 5?

    3-phase Lucas, Sparx, etc. stators have 9 internal pole pieces but can be easily identified as they have only 3 mounting holes.
    2 and 3 wire single-phase stators have 6 pole pieces and 5 holes.


    Edit: I'm not sure if a 3-phase stator even works at all with two outputs connected or the at least I think the output would be low.
    Last edited: Apr 7, 2019
  3. cterry66


    Apr 9, 2011
    I think I figured it out as it has 6 poles. I'm pretty sure its a 6V Sparx that can be used as a 12V by joining the 2 wires like mine has

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