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74 T-150 Headlight Switch Connections

Home Forums TR3OC Members Forum 74 T-150 Headlight Switch Connections

This topic contains 3 replies, has 3 voices, and was last updated by  Gareth Holder 5 months ago.

  • Author
    Posts
  • #8496

    Gareth Holder
    Participant

    Hi all, first post…

    I am bringing a 1974 T-150, US version, back to life. I just fitted a new wiring harness on it and it’s mostly been going OK. However, the old three position headlight switch was toast, so I have a new one. Of course, the wiring diagram shows terminal 1 through 8,, with connections on 3,4 7 and 8, but the new switches have combined 3/4 and 5/6 connections. I’ve tried every way I can think of to connect this new switch and have everything work, but when I get it sort of nearly there, the coils and ignition are always “hot’ even when the key is out, which is clearly wrong. Removing the brown/blue hot wire from the headlight switch allows the keyed switch to work again, but I’m kind of lost and there’s probably a know tweak for this in this community. Any help will be really appreciated before I set the bike, the garage, and me on fire, in that order.

  • #8501
    Kerrin Gautrey
    Kerrin Gautrey
    Participant

    Hi Gareth.

    The LP Williams site has instructions for this switch.https://www.triumph-spares.co.uk/light-switch-3-position-5-pole-lu31788-99-0563

    Kerrin

  • #8502

    John Nelson
    Participant

    Those instructions say to not use the brown/blue wire so that must mean no park lights.

    Almost never used park lights on a bike so not much of a loss. I think I may have set bike lights to “Park” more often by accident than on purpose over the years.

  • #8567

    Gareth Holder
    Participant

    Perfect. Worked a treat. Thanks !

     

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