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Re: TR4A Light Switch Wiring Question

To: DANMAS@aol.com
Subject: Re: TR4A Light Switch Wiring Question
From: Joe Curry <spitlist@gte.net>
Date: Sun, 25 Apr 1999 21:21:18 -0700
Cc: Alvamike@aol.com, triumphs@autox.team.net
References: <b1b0215c.24553f49@aol.com>
Dan,
Your summary is pretty well right on, except that the early Spitfire US
versions were wired the same.

Joe

DANMAS@aol.com wrote:
> 
> In a message dated 4/25/99 8:57:33 PM Eastern Daylight Time, Alvamike@aol.com
> writes:
> 
> > I just finished putting in the steering column and have connected all of
> the
> >  wiring expect ONE  wire.  I don't know where it goes.  The wire is brown
> and
> >  comes from the light switch through the steering column.  It has a male
> end
> >  and is about 18 gage.  The wiring diagram I have shows that it connects to
> a
> >  fuse wire which is Green with brown.   Can anyone tell me where that wire
> is
> >  or specifically where this brown wire connects.
> 
> 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
> 
> '71 TR6---------3000mile/year driver, fully restored
> '71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
>                     http://members.aol.com/danmas/
> '74 MGBGT---3000mile/year driver, original condition - slated for a V8 soon
> '68 MGBGT---organ donor for the '74

-- 
"If you can't excel with talent, triumph with effort."
 -- Dave Weinbaum in National Enquirer



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