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Help with MK3 Ignition Switch

Discussion in 'Norton Commando Motorcycles (Classic)' started by jaydee75, Apr 1, 2019.

  1. jaydee75


    Jul 2, 2012
    I finally decided to tackle my hit/miss key switch. I took it apart and cleaned it good and on reassembly I have a memory problem: The slotted nut on top that holds the switch into the console has a wavy washer under it. I can't remember if the washer goes below (inside) the console or on top of the console. I don't see any detail in any of the pictures. It seems the screwed neck doesn't protrude up as well as it did, but I can't
    believe the washer would seat above on the plastic. Any thoughts?
  2. Dellis

    Dellis VIP MEMBER

    Jul 22, 2018
    I don’t have a mk 3 but suspect the wavy washer is supposed to go behind the the slotted nut as a locking washer. I may be wrong but that would seem the logical answer.

    Last edited: Apr 2, 2019
  3. Danno


    Feb 7, 2010
    I have a plastic pretzel jug full of failed Lucas (and knockoff) ignition switches and have never had any success trying to make one work by disassembly/cleaning.

    The Lucas ignition switches are not very sturdy from new and seem to wear out or malfunction frequently. Replacement is the only (temporary) fix I've found.
  4. HoveToo


    Jan 1, 2012
    If the contacts were pitted you might consider putting a relay into the headlamp circuit to reduce the current in the switch. All my switches failed for that reason. The relay has fixed that problem.
  5. tomspro

    tomspro VIP MEMBER

    Jan 25, 2014
    OR solve permanently by separating the ignition circuit from other electrics using a separate toggle type switch.
    I just did it after couple of ignition failure incidents.
    Not difficult.
  6. Saber13

    Saber13 VIP MEMBER

    Dec 22, 2010

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