wiring problems

i have a 2000 silverado that my driver and passenger door illumintion lights went out. also some of the buttons in my radio went out and so did the warning horn for lights left on. i need a wiring diagram for this vehicle and possible causes. i am also having problems with my gas uage bouncing to empty and back to full while driving.

There is a level reader in the gas tank if the readr is broke or damaged then that would be why your gauge bounces!!! Or you could've blown a fuse somewhere thats causing all those malfunctions!!

i checked all my fuses i think and cant find anything. i was wondering if the body lift had anything to do with it but i have been running that for 30,000 i am stumped

Wiring schematics are available in service manuals that you can get at almost any good autoparts store.

Also, remember that the gas gauge goes to empty when it has no power. Sounds like you may have a short somewhere.