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Check your head light bulbs, your truck has the dual filiment headlight bulbs one per side which does both high beam and low beam, 9007 bulbs.
If the low beam filiments are burned out only the high beam will work.
Also look into finding out if the headlight switch is gone bad.
The headlight module and or drl module maybe defective.
First, you might check your dimmer relay fuse (under hood fuse box, number 2, (7.5A).
Hope it's that simple (if not, you will have to have the relay tested, and possibly replaced; probably something you don't want to try yourself.)
You most likely need new bulbs, or a new fuse. Check the bulbs and see that the filaments aren't burned out. If you have dual beam headlights, there will be one bulb on each side with 2 filaments inside. If you have single beam headlights there will be 2 bulbs on each side. If they look alright, find out which fuse controls your hi-beams and see that it isn't burned out.
The only thing that all of your problems have in common is the light switch and the dash wiring harness. The stereo is linked to the light switch because of it's illumination feature' You need to test the light switch with a test light by probing the wires at it's plug.