Question about Harley Davidson FLSTC Heritage Softail Classic Motorcycles

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I have a 2000 FLSTC carbureted. At startup everything is fine. When I accelerate, immediately my speedometer quits working, the odometer goes blank and the check engine light comes on. While driving down the road at any speed I hold in the clutch and start coasting; when the RPMs get low (complete idle) everything starts working again, first the speedometer, then the odometer and finally the check engine light go out. As soon as I let off the clutch everything go out again. After a while, 20 miles or so, things start working again.

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  • gbruns597 Sep 08, 2010

    I thought I was going to be getting emails so I just now saw this.

    The speed sensor was recently replaced by the dealer, so in my mind I excluded that as a possibility but maybe I should re-check it. The loose wire / bad wire possibility is that generally a bad ground wire? Any tricks on finding which wire is bad?


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I believe the sensor is likely bad or could be loose. Possibly a bad wire to the speed sensor. It is common from what I have seen before.

Posted on Sep 01, 2010

  • Nate Stansfield
    Nate Stansfield Sep 08, 2010

    The bad wire is usually the ground. You can disconnect a wire on one end then on the other end and test the wires with an ohmmeter. This will tell you if a wire is good or not. You can test power flowing through a wire with a voltmeter.


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