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[TR] TR4A - Gauge Lamp Oddities

Subject: [TR] TR4A - Gauge Lamp Oddities
From: guy at genfiniti.com (G.D. Huggins)
Date: Fri, 10 Jun 2011 10:38:10 -0500
All,

First, a quick update that I have successfully completed the installation of 
the Advance Auto Wire system into the car!
It was not difficult, so much as time consuming, and the quality looks great.
Now that its installed, I am testing and troubleshooting and have come across 
an issue with the gauge lamps.

Like with the original wiring harness, this kit supplies power to the lamps 
through the dimmer control switch on the dash.
A red wire from the fuse box supplies power, which is then transferred into the 
red/white chain of lamps as you turn the switch.

My issue is that I turn the switch and the lamps don't light.  Odd.  So I 
measure the voltage on the red/white chain and I have 12 volts!
So, the power is there, but no light.  I suspect they are not grounding, but 
I'm not sure how to ground.  
From all appearances, the physical tension of the socket in the gauge's hole 
should cause them to ground on the gauge body.  Right?

Another oddity.. if I insert the high beam indicator lamp into its hole on the 
speedo's body, the headlamps come on when I turn the interior lamps on!
This makes it sound as if the voltage is successfully going to the speedo gauge 
lamp, through the speedo body, and into the HB indicator lamp, eventually 
making its way to the headlamp relay.
Once again, this seems like a ground issue.

Any suggestions before I start making up my own solutions??

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