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No power to starter relay

Discussion in 'Motorcycle Tech Talk' started by whacker, May 3, 2010.

  1. whacker

    whacker Active Member

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    I have a 75 Sportty...I have 12 volts at the starter button...but when I push it,the votage drops to .3 volts.I'm sure I have a short somewhere on that curcuit.The lights work fine..I did replace the starter relay...hopeing that would solve my problem...but it didn't...The battery is good..I have a good ground.Any input in fixing this problem would be greatly appreciated..Al
    whacker, May 3, 2010
    #1
  3. chucktx

    chucktx Moderator Staff Member

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    make sure you have a good ground to the frame and engine....make sure the power is getting to the relay, and that the relay has its ground. can you manually jump the relay and start the bike?
    chucktx, May 3, 2010
    #2
  4. whacker

    whacker Active Member

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    If I jump the relay,it will crank,and run for a moment.The relay is grounded.
    whacker, May 4, 2010
    #3
  5. chucktx

    chucktx Moderator Staff Member

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    the power is being interrupted between the startswitch and relay.................time to start checking that wire from start to end.............any work in that area lately??? use a meter..ohm....to check continuity........
    chucktx, May 4, 2010
    #4
  6. hotroadking

    hotroadking Super Moderator Staff Member

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    you have a wire probably grounding out
    from under the tank

    I would remove the tank, open the controls and check the wire
    for any cuts or breaks...
    hotroadking, May 4, 2010
    #5
  7. whacker

    whacker Active Member

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    Yes Chucktx I did some work in that area...going to trace wires this friday...I have a meter...going to check the whole circuit out,from ignition switch to starter relay...I sure hope it's easy to find...ty for your input....Al
    whacker, May 4, 2010
    #6
  8. hotroadking

    hotroadking Super Moderator Staff Member

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    IF you can get to a dealer get a Service Manual for the bike,
    it will have the wire diagram laid out for you so you
    can trouble shoot it.

    there should be a wire going to the starter from the
    switch, pull that connector and check the volts with a meter
    I'll bet it has low voltage.

    Open up the control covers, see if a wire is shorting there

    also check the voltage at the switch incoming. YOu can
    pierce the wire with a sharpened paper clip and touch it with the
    meter and see if the problem is going to the switch or coming out.

    check the voltage on the other side of the switch,

    then you'll know where the problem is...
    hotroadking, May 5, 2010
    #7
  9. whacker

    whacker Active Member

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    I have a manual for my bike,which has a wireing diagram.I checked the voltage at both sides of the switch,with the button pushed in and got .3 volts.I started checking wires and took the headlamp bulb out,thats where a connection is,and I got 12.3 volts at both sides of the switch then,everything worked fine then...I checked connections and moved wires around so the headlamp didn't push on any of them,when I installed it, works fine now.I got lucky that was the first place I looked.
    whacker, May 9, 2010
    #8
  10. bushwackerhd

    bushwackerhd New Member

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    If the problem is gone it will probably come back, check all connections in headlight area and make sure they are all clean and tight I wouldn't want you to get stranded some where.

    Tom
    bushwackerhd, May 9, 2010
    #9

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