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1989 911 Carrera dash gauges illumination adjustment

Electrical and Electronic

Vehicle Information: Model: 911 Carrera; Year: 1989; Body Type: Convertible; Engine (type, size, modifications): 3.2l; Total Mileage: 65000;

By turning the light switch knob to its maximum adjustment, the brightness of all instrument lights is still quite dim. Do I need to replace the headlight switch or is there another approach, such as cleaning or otherwise checking for resistance in the rheostat portion of the switch?

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