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Fast flashing indicated a defective bulb - If the front signals are HD LED signals - they are probably corroded and shorting out some of the LED bulbs - and reducing power consumption triggering the ECM to think there is a bad bulb.
I have gone through 2 sets of Harley Davidson LED turn signlas - both front and back. I dismantled the first set and noted that there is corrosion on the circuit board - time frame varied from a few months up to 2 years - very frustrated - should last the life of the bike! May resort to putting stock lights back on or going after market.
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.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
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.