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Old 06-29-2003, 11:23 PM   #1
Scooby Specialist
Member#: 21977
Join Date: Jul 2002
Chapter/Region: NWIC
Location: Tahuya, WA
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Question Interior aftermarket light dimming...

OK, as most of us know, Subaru uses alternating ground to dim...meaning most all of our gauges, radio's etc won't dim with the cluster, etc... I had an idea however. I just installed a new Omori boost gauge in place of my Lamco- and when I wired it up- it dims w/ the cluster. Has anyone tapped into the black lead for dimming their other gauges? Radio? I will try this tomorrow when I get back home. Somebody's gotta be the test dummy...
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Old 06-30-2003, 02:35 AM   #2
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Join Date: Oct 2002
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This has been covered before -- see this thread:


Anyhow, the trick to dimming aftermarket gauges directly off the Subaru dimmer is that they need to use both dimmer wires on the car, and use them to light independently of any other power they may require. Most gauges expect the lighting to be done relative to ground so they only have one lighting input. If you connect this input to the positive illumination wire, the gauge will illuminate when the dash lights are illuminated, but they won't actually dim when you adjust the rheostat. If you connect it to the negative illumination wire, the gauge will dim inversely relative to the dash lights. If you don't ground the gauge but instead feed it the negative illumination line as a ground, you may risk shorting out the illumination control unit if the gauge's chassis is grounded and comes in contact with the car's chassis. If it's an electronic gauge it also won't work when dimmed because it won't get enough voltage.

I came up with a fairly simple electronic circuit -- linked to in the above-mentioned thread -- to convert the illumination voltage to work correctly with a gauge with a single illumination wire.

I haven't seen an Omori gauge in person. Does the Omori gauge have two illumination input wires? Did you hook both dimmer lines up to them then? Does it (the gauge itself) properly function when dimmed?
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