85 GMC C2500 Dash Lights Not Working Please Help

[RustyPile]

The dash light power leaves the headlight switch and goes through the rheostat on the front of the switch, then to the green wire.. If the light switch knob is rotated all the way clockwise, this will turn off the dash lights.. Check that first.. If rotating counterclockwise doesn't bring the lights back, the rheostat is probably burned out.. To the best of my knowledge, the rheostat is not serviceable...