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the truck ran fine last night did a little mudding shut it off and it started back up go out this mornig and it wont start batteries are fine when the ign is off i have power to the cigarett lighter but as soon as i turn it to the on position no power what so ever
Probably a bad connection at a battery terminal, engine ground, or most likely at the starter solenoid. If you don't have a voltmeter or test light start with cleaning them.
it decided to start today after doing nothing to it
I'd go ahead and clean the connections I mentioned above. You know it will do it again at the worst possible time. You might also want to carry a voltmeter or test light with you in case it does it again.
Check the connections at the battery, if it goes dead like that it's usually a poor connection there. It'll run the lights and lighter socket since they're low power but when you start trying to pull hundreds of amps...