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I guess you are saying that after you turned the ignition off, the headlights and all lights went off, but when you returned and turned ignition on all lights but the headlights came on. "a gremlin" stole my light switch? Possible, but most likely your headlight switch is bad, or the headlight relay, or if the dimmer switch makes no difference, It could be power supply or connection to the headlight dimmer relay is bad. Corrosion causes funny behavior. Clean bright metal connections make a world of difference. Follow headlight wiring back to a small box usually on the inside fender of the Engine bay. Check all connections including the ground to the frame (body metal).
First I would suspect the dimmer switch on the steering column or wiring in the column. Second I would suspect a bad ground wire or ground connection. Here is link to a forum where others are having lighting problems with daylight running lights. The whole DRL system is rather a complicated maze of relays and connections, any of which could cause your problem. The tip on the forum to get a wiring diagram form Autozone looks like a good deal.
Grab the main harness where it exits the firewall and move it around to see if you can make it happen. Continue working down the harness down along the frame towards rear of truck, It was a problem on the diesel models back then
Your voltage goes down after you start the truck? Your voltage should climb up to 13.5-14 volts (at the battery terminals) with the truck running. If it does not climb to that area you have some kind of alternator problem.
Do all the lights...headlights, etc.....turn on and are bright like it has a fully charged battery? If so, try tapping on the starter with a small hammer or whatever. If the starter will now turn the engine over, it is time for a starter motor replacement. 11 year old starter might have given up by now.
I finally broke down and took my truck to the dealer. It took them two tries, but they finally figured it out. It turned out to be the wiring harnes for the shift lever. When it exits the steering column, it was being chafed, and eventually wore through a wire and was intermittently shorting. It would blow a fuse (don't remember which one - I think it was on the bottom row, third in from the right. 20A). It stopped the alternator from charging too. They replaced the shifter harness and the problem went away. I did get a ticket while my speedo was inop however.