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A good alternative to the stock bulb is the "Xenon BriteLite" from the NAPA parts store for a headlight that is much brighter than stock. NAPA will probably have to order it for you (part number BP1260/H4BL), but it is a direct replacement for the stock H-4 bulb.
The Sealed Beam Headlight on the '02 Fat Boy is just dim - no other word for it. Replace it with the same set up used in the rest of the Harleys - an H-4 bulb and reflector - cheap! JC Whitney sells item number "13zx9314a, H4 Halogen Headlight, Round MC" for $16.95, this kit includes the H-4 bulb, rubber boot to seal the bulb and the reflector. It is plug and play, remove the sealed beam light and install this kit.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.