XS 400 signals

Discussion in 'Motorbike Technical Discussion' started by Freddie, Jul 7, 2006.

  1. Freddie

    Freddie Guest

    I have an odd situation, but here we go!

    I have an 1980 Yamaha XS 400 Special. I replaced the left control
    housing, as the switch on the older one was shot for the turn signals,
    and replaced with a brand new flasher relay from the dealer.

    This is what is odd, when I go to turn on the blinkers left or right it
    lights up the back only, and it goes solid for each side selected. It
    does this with a singal click of the relay. So the front signals do not
    work, and it does not flash, except when I rev the engine to 3,000 they
    start flashing?

    This is what I have done so far:

    - Changed the fuse
    - Bought a new relay
    - Working left housing

    I am thinking it could be bulbs all the way around? Since this kind of
    regulates voltage... The wierd thing is that the back signals light up
    and only flash when going over 3,000 RPM? Could it be my battery? I am

    Freddie, Jul 7, 2006
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  2. Freddie

    jojida Guest

    However my bike did this once and the cause was a dying battery
    you can check it with a multi meter it should have at least 12 v with
    ignition off and i believe 12.5 or 12.7 mayby higher when running
    hope this helps
    see ya
    jojida, Jul 7, 2006
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  3. This is what is odd, when I go to turn on the blinkers left or right it
    I once had this type of thing explained to me. As I understand,
    blinkers switches switch on and off by using a bi-metal switch. The
    two metals with different thermal expansion properties are put together
    in a way that the switch is closed until it heats up. Then the metals
    expand and the switch opens. The stip cools and the switch closes
    again. So, if you have a bulb out on the front of your car, the back
    one stays solid because one bulb doesn't draw sufficient current to
    flip the switch.
    So, applying this to your situation, a weak battery might not have
    enough current to make the switch flip, but when you get to 3000 rpm,
    your charging system compensates. It's at least a theory. I'd check
    the battery and then make sure you have the proper bulbs in place. The
    new parts might require a different load to operate properly. Hope
    this helps.
    2000 Suzuki katana gsx750f, 1984 Honda Magna V45, Jul 7, 2006
  4. Freddie

    Freddie Guest

    Alright! I got it fixed! I reseated all the wires, replaced each bulb,
    and used a wire brush to clean the sockets. I then found out in the
    headlight bucket that the 2 ground cables, for each front signal were
    off, and had to be fastened properly. This got them blinking like a
    charm! So the voltage must had overcome the resistance at 3,000.

    It is intresting to note however, that the back lights always worked,
    and if the grounds are not grounded on the front side, since the system
    is looped, then it will just go solid and not flash even on the back.

    Thanks Guys!
    Freddie, Jul 10, 2006
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