Dan,
On further examination of the Spitfire and TR4A schematics, I have
determined that I am all wet. Apparently the Spit uses a different fuse
entirely (the horn fuse) to tap the voltage for the flash circuit, where
on the TR4A the one that serves the voltage stabilizer. So you
apparently your description is correct. By the different wiring on the
US Spits, they were able to have the flash circuit operate even with the
ignition and the lights off.
One more curious thing I am trying to figure out. The schematic of the
Mk1 Spit shows the horn fuse is always powered whether the ignition
switch is on or not. I'll have to re check, but I don't think my horn
honks unless the switch is on. Oh well, something more to pull my hair
out over. With the change over from generator with control box to
alternator, a number of those wires were re-routed. Perhaps that was
one of them.
Regards,
Joe
Dan Masters Wrote:
> > > Mike,
> > >
> > > If I read the diagrams correctly, this wire provides the power for the
> > > "flash-to-pass" function of you headlight switch. It appears this was the
> > > first TR series to have this feature, and it seems to be unique to that
>model
> > > in its operation.
> > >
> > > TR4A owners correct me if I'm wrong, but it seems that:
> > >
> > > a) this feature is only available when the ignition key is on,
> > >
> > > b) It only works if the headlights are off, as it flashes whichever set of
> > > headlight beams the dimmer happens to have selected. If the headligths are
> > > on, it only adds power where it is already applied.
> > >
> > > Power to this function comes from the green fuse, and is a unique
>application
> > > of the color code for these cars, as usually the brown wires PROVIDE
>power to
> > > circuits from the battery.
> > >
> > > This is interesting, because if you turn on your headlights, you can power
> > > all your ignition keyed accessories by operating the flash to pass
>feature.
> > >
> > > Any TR4A owners care to evaluate this and let me know if I'm wrong? (it's
> > > late, I'm tired, so I may be way off on this) With the key off, the
> > > headlights on, operate your flasher for a moment and see if the gauges
>come
> > > alive.
> > >
> > > Dan Masters,
> > > Alcoa, TN
>
--
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer
|