Not 100% on this, but when you turn on the head lights the clock dims. The clock has 2 lights inside, the bright one when the head lights are off, so you can see it in the sunlight and the other one for when the head lights are turned on, dimmer as not to blind you at night. I think the dim light went out. When I say light, it is not a light bulb per say. There is 1 wire going to the clock from the dash lights, dims & brightens the clock. Since the clock is digital it would be done with a regulator inside the clock. Looks like it is time for a new clock, could get one from a wrecking yard.
2010 Shelby GT500, Kona Blue W silver stripes.
2007 Shelby GT500, Vista Blue with Tungston gray stripes, 1 of 119, Wifes car...
94 Cobra Pace car Convertible # 591
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2001 Cobra vert # 2001 SOLD