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Are the new lamps going to be additional, or replace some of the incandescent lights? If they are additional, you should be fine. If not, you may have to experiment. The need for a load equalizer, or ballast, is due to using all LEDs in place of incandescents, which misleads the stock flasher into thinking the bulbs are blown.
it also depends on the year of your bike, on my 2010 fxdc i have LED on the back and incondecent on the front... my TSM has the ability to regulate the flash and does so effectively
hey thanks alot-i'm putting on two additional lights-one on each side-next to the seat-on the luggage rack bar-useing them as running and signals-right NOW-i'm keeping the rest as they are-incadescent. It's an '11 FXDC--thanks again