The dash light that shows the cab bed light is on stays on constantly. I have checked the bulbs and they are ok. No matter whether I press the switch so it is in or out, the light in the dash will not go out and the bulbs do not burn. I seem to think the switch itself has gone bad. What do you think????

Is this the switch on the left of the steering wheel or the on under the radio?

It is on the dash to the left of the steering wheel above the button for the fog lights.