[Healeys] Turn Signals

[john harper]

Jim

I fully agree with your description of an 'old' flasher unit but it was not
a bi-metal strip but a wire under tension that extended and lost its
tension when current went through it and cut off the current, similar to a
bi-metal strip. The wire then cooled and shrank allowing the current to
flow again.

On Sun, 16 Oct 2022 at 04:55, Engl <engl at accesscomm.ca> wrote:

> Hi Jim
>
> You are 100% correct. I should have said lower resistance.
>
> V=IR and all that.
>
> Thanks.
>
> Bob England
>
> On Oct 15, 2022, at 8:17 PM, jim <ab7vf at yahoo.com> wrote:
>
> 
>
>
> . 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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