start with the bulbs, if they are Ok, then look at the switch. There should be a separate lug or terminal on the switch for the instrument lights (they are the only ones that dim). You also need to check the rheostat on the switch (looks like a round spring on the front, right behind the dash).


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof