Mark, I tend to think Chris K. is right about each gauge having it's own ring
terminal connected to a black ground wire under the thumb screw. That's the
way my wood dash 1964 TR4 is also.
If that wire is present, then the next thing I would check is that the end of
that ground wire is connected and has good ground. Mine terminates under one
of the dash bracket screws. Next, I would ensure that the gauge light power
wire, red with white stripe, runs from the large gauges to the small gauges
and hasn't been cut. ISTR that only one power wire connects all the gauge
lights.
Your intermittent light problem is undoubtedly the Dash Light Brightness
Adjuster rheostat. (On my wood dash car, it's the dash knob to the left of
the steering wheel) I have to fiddle with mine to get a good contact spot.
Someone once posted the easy solution is to bypass the rheostat altogether.
Seems to me there are 3 wires, so you have to know which ones to connect
together. Sorry, I don't remember which ones.
paulw
1964 TR4
1956 TR3
----- Original Message -----
From: Chris Kantarjiev
To: triumphs@autox.team.net
Sent: Wednesday, April 20, 2005 1:30 PM
Subject: Re: Tr4 dash lights
Mark,
I'm not *certain* about the TR4, since my experience behind the
dash is with a 4A, but I suspect that there should be a black
wire with a ring terminal that goes to the bridge of each of
the small instruments, to provide ground. With the metal dash,
this might be different - the expectation might be that the
bridge will ground to the panel, which is then somehow grounded.
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