[TR] Master Cylinder help part II - PDWA

[v6spitfireguy at cox.net]

Randall,
I have a copy of a 71 GT6 wiring diagram that has it - If you still want a
copy I'll have to scan it later though, and it probably wont come out all
that good, it's rather small.   - Basically a wire comes from the fuse box
(same terminal the ignition is connected to), then the brake warning light,
into a  four terminal bullet connector. The other end of that splits with
the brake line failure warning switch (PDWA), then to ground, wired in
parallel with the oil pressure warning lamp (from the bullet connector),
then the oil pressure switch, then to ground -


 Barry Schwartz


Original Message:
-----------------
From: Randall tr3driver at ca.rr.com
Date: Thu, 30 Apr 2009 08:50:07 -0700
To: triumphs at autox.team.net
Subject: Re: [TR] Master Cylinder help part II - PDWA


> Must check the wiring diagram.  I recall thinking that it seemed a
> curious way to wire something.  Or did I forget that?

Nope, that part is right on the money!

I believe the same US regulation that required the warning light also
required a "bulb test" function.  Triumph chose to implement the bulb test
by wiring the brake light in series with the oil light, so that both would
come on at partial brightness when the oil pressure switch was closed.  This
has the curious side effect of disabling the oil warning light if the PDWA
is activated; and making it only half-bright even when not disabled.

If you find a GT6 wiring diagram that shows the PDWA, I would like to have a
copy.  My early GT6 factory manual mentions the PDWA, but the only wiring
diagrams given do not show it.

-- Randall
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