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Zener Diode question

Discussion in 'Norton Commando Motorcycles (Classic)' started by Yellow_Cad, Apr 22, 2009.

  1. Yellow_Cad


    Apr 2, 2008
    If the zener diode is faulty, is there any problem with disconnecting it and running the motorcycle for just a five minute period.?
  2. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Nov 20, 2004

    Not if you keep the revs down. Maybe turn the lights on as well?

    Don't let it go over 16Volts if you have an electronic ignition?
  3. motoracer8


    Mar 2, 2009
    To check your Zener, use a 12V battery, use a test lamp and a ground wire, or just touch the stud to one side of the battery, your test lamp to the spade tang. The test lamp should lite one way and not the other. If the lamp lights both ways or not at all the diode is bad.

    Sometimes corosion or dirt over years will build up between the Zener and the heat sink then they will over heat and fail. You can buy a good rectifier/regulater for less than a pair of new Zener diodes.

    Ken G.

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