Lights will not go off even with key off

This may be a bad headlight switch or it may be a drl module if you have daytime running lights check headlight switch first check the brown wire see if power is still going to it after switch has been turned off. It may also be your warning module but check the brown wire first as that can cause warning module to ding like it is. You'll have to get tit scanned to see if modules are problem.

Check body ground from battery and eng/battery grounds then otherwise unhook warning module and see if lights go out. If they do your module may be bad or something is powering it up like a melted harness etc.

Try disconnecting anti theft module if lights go out the module is bad however your truck won't start

Try running it like that and if it gets to where it won't start try hooking the plug back up if it starts you are golden