[T3] Lights
Jim Adney
jadney at vwtype3.org
Sat Nov 4 14:43:34 PDT 2017
On 4 Nov 2017 at 17:21, Dave Hall wrote:
> Thanks, Jim. I wondered how the bulb failure system worked. Further
> research is indicated.
Yeah, this was always a mystery to me, part of which was that there is a
second relay in our TS flashers that I couldn't explain. it didn't occur to me
until a few years later, when I was looking at SCR phase control switches
that I saw that they make special versions "for tungsten loads." I didn't
understand what that meant, until I remembered that light bulbs have huge
inrush currents, so the SCRs have to be rated for that. And that inrush
current would trigger the 2nd relay in our flashers.
I rebuilt a TS relay for someone on this list a few years ago, and I could
never get it to work right on the bench, because I was just loading it with a
resistor. I never heard how it worked on the car. If that person is reading this,
let me know how that worked. If there was/is a problem, I think I can improve
on it now.
If it worked, that would be good news, too.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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