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Old 01-31-2005, 11:50 AM   #1
Scooby Specialist
Member#: 36793
Join Date: May 2003
Location: Malden
04 WRX

Default Gauges jump when AUX dimmer turned down

I have an 04 wrx. I intalled a set of Omori gauges into a din pannel. Every thing works fine for th emost part. My problems occure when I go and turn the dimmer down to around 1/4 or lower power. The neadles on the two elctrical gauges start flaking out. Jumping up and down. If I turn back up th einterior dimmer it subsides.

The gauges are all spliced into the clocks dimmer unit. Is there a electrical explamation and solution for this?
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Old 01-31-2005, 12:26 PM   #2
Scooby Specialist
Member#: 5887
Join Date: Apr 2001
Chapter/Region: BAIC
Location: Fremont, CA USA
2002 GDAA (bugeye)
797 (blaze yellow)


Afaik, many electrical gauges only have 3 leads on each of the gauges: signal, (+) power, & ground. Connecting the (+) power & ground to the switched/dimmed supply to make the backlighting & needle dim & brighten along with the oem interior illumination means altering the voltage to the electronics that perform whatever measurement the gauge is supposed to do.

The reason is that electrical gauges with 3 leads are designed to be wired into cars with variable (+) supply instead of switched ground. Since Subaru uses switched ground for the interior illumination, you will either need to add a conversion circuit to power electrical gauges with 3 leads, or live with the fact that you can only use the constant illumination on them.
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Old 01-31-2005, 10:57 PM   #3
Scooby Newbie
Member#: 5385
Join Date: Apr 2001
Location: Rapid City, SD
2012 WRX Base
Ice Silver


Does your gauge have separate wires for the lighting?

Or is it the 3 wire type that satrya described?

If it has separate lights and signal, FIRST you need to actually ground your gauges to a good ground NOT the illumination ground, because the illumination ground isn't ground, it varies from ground (lights bright) up to 12 volts (lights dim). I suspect this is why your gauges go batty when you dim the lights, they aren't grounded properly.

If you do have separate light wires on the gauge, you need to put one terminal of the light to a +12Volt line (probably the same line you use for the gauge power) and the other side can go to the "variable" or "ground" side of the illumination on the clock.
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