Instrument Panel Light Dimmer Switch - Ford Mustang Forums : Mustang Forum
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post #1 of 1 Old 07-14-2019, 10:25 PM Thread Starter
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Instrument Panel Light Dimmer Switch

All of a sudden, the instrument panel lights went out last night on my 1991 LX Hatchback. Fuse is fine, and the overhead light still works. I've seen carbon pitting on some of the all in one light switches (and have fixed them), so i removed this one. It has two steel coil style resistor wires wrapped around a plastic shaft. There is one on the top and bottom of a gear drive wheel, and there are two 'points' one on top and one on the bottom, each of which contact the resistors.

I proceeded to use a small cleaning wheel (Dremel) to clean up both the coil wires (weren't all that bad). The points i cleaned up with a small ignition file, and there were also two buttons, again one on top and the other on the bottom, that were at the 'end' of the travel where the overhead/dome light engaged. I cleaned up each button (one was copper colored the other more silver color) as well. Put some D5 Deoxit on the whole thing.

Now, I actually get dash/instrument panel lights full, but in a very very small area of travel, right next to where the overhead light engages. It's easy to get both overhead dome light AND the instrument panel lights on at same time, but getting just the instrument panel lights on without the dome light is tricky. You have to nudge the dial to the left ever so slightly away from the full right setting. But go a little too far and the instrument panel lights go out altogether. The 'fade out' no longer works.

Something is still wrong, obviously. Would anyone have any advice? There appears to be a small resistor inside the unit that you basically can't get to without tearing the thing apart (but i'm thinking about it!). Betting it is bad.

Has anyone rebuilt one of these fully?

Robert Tilton

1995 Impala SS 396 LT4 intake/heads with GM/Crane 847 Cam Tri-Y headers T56 4.56 gears 58mm TB RAISS intake Cat delete OBD2 PCM Bryan Herter Programming
1974 F-100 390 HP
1991 Ford Mustang LX, 5.0L, Bone Stock
1996 Buick Roadmaster. LT1. Bone Stock
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