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2000 Fat boy starts sputtering and lights flash on and off

I have a 2000 Fat boy. Starts fine but once it warms up after riding for a bit, it started coughing and sputtering and my rear lights started flashing on and off.

I am thinking it might be either points and connectors/coil or voltage reg. Any thoughts?

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Well it's not points (there are none ) so now we have to figure out if it's elec. or fuel ? so after the motor has warmed up and idling spray soapy water onto or at the intake seals from the left side of bike if idle changes your intake seals are leaking, as far as the regulater goes there is no way to test (says harley ) other than a voltage output test, the primary coil grounds thru the ecm

Posted on Dec 28, 2009

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Check you battery terminal connections. Can't think of any other reason that the rear light should be fluttering. If battery is tight then trace through your circuit breakers with a test light.

Posted on Aug 17, 2009

  • danellison Aug 20, 2009

    Sounds more like a wire is shaking in the wind and shorting out. Can't think of any reason that the coil or regulator would cause the rear lights to flash on and off.... Do you have plenty of clearence between your battery terminal connections and the frame? Same question for circuit breakers. There really isn't anything else that links engine misfire with tail light flashing on and off.

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