Honda ST70 1972 6v Wiring diagram req

Discussion in 'Classic Motorbikes' started by Speedgazebo, Dec 22, 2007.

  1. Speedgazebo

    Speedgazebo Guest

    As per subject, it's for a 6v UK model with an on/off ignition key switch
    and three position light switch ( off/side/headlight) mounted on the lh
    headlamp bracket, no indicators or high beam indicator, and a dip/high beam
    switch on the lh handlebar. All the diagrams I have managed to find so far
    are all for different types with different combinations of switches. I would
    be most grateful if anyone has one of which I could have a copy.

    I have a problem with the lights, the side and tail light works ok in the
    first position, but when I switch the light switch to the second position
    the side light and tail lligh go out. I think probably that in this position
    there is a different feed from the lighting coil and I want to check it, I
    have tested the light switch and dip switch.
    Speedgazebo, Dec 22, 2007
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  2. It's a C90 wiring system, so look at a C90 diagram.

    When I rebuilt my ST70, I didn't have any trouble with the electrics.
    Just put the loom in the frame, plugged everything in, and it worked.
    The Older Gentleman, Dec 22, 2007
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  3. Speedgazebo

    Speedgazebo Guest

    I'll try a C90 diagram then.
    Speedgazebo, Dec 22, 2007
  4. My bad. C50/70, though I daresay the wiring is the same. The engine, as
    I'm sure you know, is a C70 lump, itself a bored-ouit C50 lump.

    This is a silly question, but when you turn the key to the second
    position, and the lights go out, the engine does keep running? If not,
    then the second position may simply be 'OFF'.

    IIRC, the side light and tail light can be activated without the engine
    running, with the switch in 'PARK' position.
    The Older Gentleman, Dec 22, 2007
  5. Speedgazebo

    Speedgazebo Guest

    No. the engine dosen't stop, the problem is with the light switch, not the
    key switch, the key switch only has two positions, - Off and Run, the light
    switch has three - off / side / headlamp and none of the lights will
    operate if the engine isn't running, I remember that from having one years
    ago, I think I have sorted out where to look, when the light switch in in
    the third position ( headlight) the supply comes from the coils on a
    Brown/Red wire, this dosen't seem to be live so tomorrow I'll check it out.
    It was all working fine the other day, but now it's just stopped so it can't
    be anything too serious.

    Thanks for your help.
    Speedgazebo, Dec 22, 2007
  6. Er, that is because the head and tail lights run directly off the
    flywheel. No engine rotation, no lights.
    The Older Gentleman, Dec 23, 2007
  7. Speedgazebo

    Speedgazebo Guest

    It's fixed. Broken yellow wire in the loom.

    MOT on Christmas eve?
    Speedgazebo, Dec 23, 2007
  8. Gotta be done :)
    The Older Gentleman, Dec 23, 2007
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