You did not say if it clicks or makes any noise when you try it. If it does then the starter is most likely the culprit. Make sure the battery leads are clean and check the black lead where it attaches to the engine. Also check for a small usually braided wire from the fire wall to the engine.It is the chassie ground and can get broken due to the engine vibrations.
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Firsthogman
Love them Harley's

