I am sure probably not the case here, but are you moving the correct dimmer switch? I thought the same thing. Then I realized I was moving the dimmer for the ambient lighting and not the one right next to it for the dash and courtesy lights.
Spending time learning the science of the mechanisms of friction, lubrication, and wear of interacting surfaces that are in relative motion
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery