Owners manual should tell you where the fuse box is, I can't remember off the top of my head but it may be under the dash on the drivers side, there is also a box under the hood but I don't think the dash light fuse would be under there.
If the fuse is good the dimmer on the dash could have gone bad.
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The same thing happens on my 2003 Impala. I found that my dimmer switch has an intermittent failure where sometimes the dash lights go out even with the headlights on. If I wiggle the dimmer just right, the dash, radio, steering wheel, door locks, and every other light comes on (when the headlights are on). My fix was to mount my Garmin on the steering column in front of the speedometer so when the lights go out I know how fast I'm going. A replacement dimmer (or bypassing the current one and adding a resistor) should take care of it.
When say "dash light" I'm assuming you mean the nighttime illumination for instruments like the speedometer for example. If your truck has a stand-alone digital clock (not part of the radio) that has a feed wire from the instrument panel lights for it to dim at night, otherwise it'd be too bright. That could be a source of a short. The radio also makes use of the dash illumination as well, making the digital display darken at night and lighting the radio's controls and face plate at night, another source of a short in this circuit. Do not ever increase fuse ratings when replacing a fuse, that defeats the safety purpose of the proper fuse being able to blow, opening the circuit which prevents wires overheating and potentially catching fire. You don't want to go there. If you have recently installed another radio the wiring may be wrong. This happened a LOT on Pontiac Firebird's and TransAm's. People often wrongly assumed all black wires are ground and ended up grounding the dash illumination input. This blew the dash light fuse and made the retracting headlight doors stay up.
There is a wire that comes from the dash lights and lights up the radio at night. You probably hooked that wire up wrong, causing the fuse to keep blowing and now maybe the dash lights are toast from repeatedly being shorted.
on the dash to the left of the steering column there should be a dial for the lights to dim or brighten them on the dash display and if you turn this all the way up it keeps the dome light on. if you have an owners manual it will help alot otherwise autozone is also helpful with diagrams and such for fuses and relays if that ends up being what is wrong but it sounds like the dash display light got turned down when the person installed your radio