Honda Nighthawk Turn Signal Problem

Discussion in 'Motorbike Technical Discussion' started by Paul Herrera, Sep 26, 2003.

  1. Paul Herrera

    Paul Herrera Guest

    I hope you guys can help me with my problem. Bought a used CB250 and
    had to replace a few parts to make it street legal. One problem i have
    is that the left turn signals don't work. When I click on the turn
    signal, I hear it click once. The front left blinker comes on and
    stays on. The rear left blinker doesn't light up at all. I checked the
    bulb and it is in working conditions. The right-side turn signals work
    (after a slight hesitation).

    I am thinking that the problem lies with the turn signal relay. I have
    several questions regarding this part. Is it something that can be
    fixed? Is is better to just replace it? How much does it cost? Where
    under the seat is the relay located? What is involved in replacing it?
    Why are men and women so different? And where can I find a owner's
    manual for this beast?

    Thanks for any help you can give me.

    Israphael (and his CB250 "Naga")
    Paul Herrera, Sep 26, 2003
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  2. Paul Herrera

    Polarhound Guest

    It is the relay.

    They are about $4 to replace.

    Replacing involved unplugging 2 wires and pulling it out of it's rubber
    Polarhound, Sep 26, 2003
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  3. Paul Herrera

    Manfred Guest

    Check the wattage of the bulbs, it may be that the left side is not
    providing enough current draw to activate the relay (swap the left and right
    bulbs over).
    Most relays are interchangeable, as long as the current requirements are low
    enough and they have the same number of pins.
    When we change relays, we tend to use chinese "flash anything" relays as
    these only require 2*10w to operate.
    Manfred, Sep 26, 2003
  4. Paul Herrera

    bob prohaska Guest

    The same relay flashes both sides, so if it works on one side I'd bet
    the flasher is ok. You might check the system voltage; on my small
    bike (a 200 with a really marginal charging system) there's a long
    delay before flashing starts and it gets longer with lower voltage.

    A bad connection or two could put one side over the edge while the
    other still works.

    bob prohaska, Sep 27, 2003
  5. Paul Herrera

    Steve 65 Guest

    Except it's not the relay. If it was, the right-side
    signals would show the same symptom.

    It's either the left-rear bulb, or the wiring to it. With
    any luck, it's as simple as a wire not being plugged in. It
    could be that the wires are crossed, and it could be that
    one of the connectors is plugged in but isn't making contact

    Swap out the bulb with a known good one, or swap that bulb
    into a signal known to be working. Don't assume that because
    you don't see a break in the filament it's good.

    If the problem moves with the bulb, the bulb is bad.
    Replace it.

    If the problem stays at the left-rear with a known good
    bulb in the socket, it's the socket or the wiring to it.
    Check all the connectors and trace the wires looking for a

    Steve 65
    Steve 65, Sep 27, 2003
  6. Paul Herrera

    Polarhound Guest

    The other thing to check is the ground. I'm not too familiar with the
    CB250, but the old CB750's grounded to the mount itself. On my 75
    CB750F I had a front light stay on and the rear not light at all. To
    fix this, I removed the whole rear and scrubbed the mount on the stalk
    with 0000 steel wool and shaving cream. Stainless steel or brass
    toothbrushes work as well. Once I did this the worked perfectly.
    Polarhound, Sep 27, 2003
  7. Paul Herrera

    Charles Soto Guest

    Replace the blinker fluid. It has probably all run out...

    Charles Soto, Sep 27, 2003
  8. same symptoms 20 years ago on honda's were sorted by directly
    earthing the (metal) flasher unit.
    .....if its plastic today this tip aint a tip no mo'
    Whatever though, you have a bad earth some where.
    tim r
    TIM [email protected], Sep 27, 2003
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