Most motorcycles use a "flasher" to operate the signal lights.Older ones used a mechanical type that heared up a bi-metalic strip that flexed, then cooled down and make contact again. usually it made a clicking sound. they are very similar to the auto flasher that you can buy in any auto store. newer ones use an electronic type with transistors that time the operation. The older ones used a lot of current and if the battery was low, then they tended not to fully operate. the newer ones use very little current and operate most of the time if the battery is reasonably charged. The flasher looks like a small can with two or three blade plug ins, that plugs into a position on the wiring harness.
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