Dash lights not working

Hello, I have a 2002 Toyota tundra 4.7. The other day I changed out radio and now no dash lights. I’ve checked all fuses and there good. Could it be the dimmer switch? How do I test for power in the instrument cost? Any help would be greatly appreciated

 

Easy suggestion any time you're dealing with an issue. Remove the suspect.

Do the dash lights return if you unplug the radio, then turn the car on? (be sure to re-plug the harness that goes into the back of the dash bezel).

Alternate take: Disconnect only the wire you believe to be the dimmer wire, and see if dash lights return.