Sounds like switch is going bad or gone . You can try cleaning the contacts on the switch with emerycloth or fine sandpaper. I think there's a thread on this forum that tells you how. Use the search.
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2010 FLTRX Wimmer Better Sucker,Stage 1,Xied's,no cat,fatstick with open end cap. 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers.1996 FXDS-CONV S&S E.Screaming Eagle ignition,V&H Short shots. 1978 Strokershovel Lowrider 100 inches. 1974 Suzuki GT750 Lemans (Water Buffalo)