Turn on ignition , does nothing checked battery it has 12.5volts. nothing works no lights, radio door locks.

It indicates a loose battery terminals.

Dave, Nuetral Saftey switch will not make the accessories not work. Sounds like a loose or corroded, battery cable.. Check that first.. If the cables are tight and clean.. Check the condition of the battery.. Sams club or Costco will check it for you for free.. Possibly the auto parts stores will too.

The Key would not work the Door Lock or your Remote?

Corrosion on your Battery if no lights are coming on or your Battery is going bad and you need to recheck it

look for another fuse box in or under dash. still sounds like you have a blown fuse. look in owners manual for all fuse box locations,including underhood electrial center. good luck.

If the battery is dead, the ignition keys will not come out of the ignition cylinder. Don't force the ignition key to ensure you do not damage the pass lock system in your ignition. Jump the battery or replace it to get enough voltage to remove the key's from the ignition and check the fuse box for any blown fuses. Good luck and keep me posted.

check fuses for dash lights if you use a12 volt tester turn on runnig lights and check dash lite fuse for power the radio maybe on same curcit/

if you dont have in depth knowledge of vehicle systems, this will be difficult.
security/immoboliser problems are best scanned to pin point the problem.
if your key is the transponder type, have you checked/replaced its battery?

i had a similar problem on my ford probe. i found that the fixed live to the radio had split. it left me with only switched power from the ignition. over time it shorted out and i lost radio, central locking and dash lights. i replaced the fuse in the back of radio and had to have the wiring checked! oddly when it was checked over no other faults were found apart from the split live.i replaced the live feed, reconnected the battery and everything was fine. Dont know if this helps but u never know. Good Luck

Sound's like you have some sort of a short or an open, somewhere, i would first check your fuse box,
in your engine and in your dash with a test light. make sure all fuses are working, if you had an open or short it could be possible you blew various fuses with a certain surge of power..
Second.. if you have an aftermarket sterio and all said before turns out alright. then i would pull out and check the wiring in the sterio and all surrounding it, one could have been rubbing up on another bare wire or ground out.

good luck..

the main terminal is a heavy red wire attached to the fuse block it should be clean and tight. also you can hook a test light from the battery neg. to the terminal it should light. if it doesn't light you could have a bad engine ground (primary ground). or a poor connection tot he main fuse block terminal previously mentioned