[Healeys] Turn Signals

[jim]

  . As the signal light flashers ground through the signal lights, there has to be something to provide a higher resistance than pure LED’s.

> 

Are you SURE you mean "higher resistance than pure LED's?    

Back in the old days signal flashers were composed of (among other things) with a "bi-metallic strip".  The purpose of said strip was to bend when heated by current flowing through an associated heating element and interrupt (flash) the bulbs.  If normal signal bulbs (1157 type) operated at nominal 2 amperes current flow, 2 in parallel (front and rear per side) flow 4 amps would flow through the flasher.   A standard single junction LED can "light" with around 20 milliamperes of current.  High current LEDs or LEDs with associated ballast resistors are necessary to flow the MUCH higher current needed by the non-electronic flasher
Jim
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