Re: 1957 Chevy 3100 Headlight Switch Help
Might also check the "rheostat" type portion of the headlight switch you have. This part of the switch looks like a spring. If it is broken or corroded your dome light won't function correctly. It will also affect your instrument gage lights. The dome light is powered by the "notch" at the end of the travel of the knob of course. May also check the ground on your dome light as another possible cause.
Good Luck
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