Several electrical functins don't work (trunk

If u can get in truck thru backseats a lot of card these days have latches on the interior of truck

yes actually, you might need to lay on your back with a pair of pliers though, when you pull on the hood-release handle under the dashboard, you will see a wire cable behind the plastic handle, grip that wire with the pliers and pull till you hear the hood pop, then adjust the cable from under the hood to remain shorter.(it's stretched a bit over time is all)

If you are not using the original/factory key it won't start. There is a chip in the original. Hope it helps

All you gotta do is hit the on button on your steering wheel then accelerate to any speed above 35 mph. Once there you press set and the cruise control takes over.

new fuel levelsenosr, and in the trunk there should be either a button or switch by the lock to make button in dash work

I would replace the light switch, but first I would have a confederate
go around and jiggle all the door jamb switches while I observed the dash lights. Something is loose, often the brightness control for the dash lights is the culprit.

Some newer vehicles will need resetting of computer after messing with battery. Check owners handbook or repair manual for your specific vehicle.

Change the battery for the remote look for a switch on the interior light

Sounds like you have a serious electrical problem that may require a shop (dealer) to repair. Have you tried removing the interior bulb that you replaced to see if the car goes back to the before state? I would recommend that you take it to a professional as electrical problems can be tricky to diagnose especially if you do not have the tools and expertise.

Without looking at it how do we know what you did ! Looking at the wiring an view wiring diagrams to see what's up is what would need to be done . Do you know what wiring diagrams are ? Free one's here http://www.bbbind.com/free_tsb.html .