The switch isn't where you think it is. The turn lever pushes down a plastic hootie inside the column (looks kinda like a snowboot if looking from the steering wheel end) that in turn pushes a rod that goes down the column to the switch. The dimmer switch is actually attached on the left side of the column, about half way down, right next to the ignition switch. It's adjustable, so that may be all you need to do. If it's a tilt column, and the tilt mechanism is loose, the dimmer might not work. To fix that is a lot more work and does require you to dissassemble the column.