Turn the key on to the ign. position (just before crank) and leave it there 15 to 20 mins. The security light should go away.
Sometimes this happens because the ignition tumbler gets worn out. Not likely as you don't have many miles on this truck. Although it could be that it has been started and stopped many times. The security system is based on a key inserted in the ignition to send a resistance value to the computer to determine if someone is starting the vehicle with a key or if someone has broken the ignition switch and is trying to hot wire it.
It also sounds like a separate issue with the drivers side door. Many times corroded connectors are to blame for issues like this. I would definitely suspect a corroded connector being as how it is so intermittent. If it sits for long periods of time moisture could collect and not get a chance to dry if there is no air circulating like there would be if it were driven every day.
One thought comes to mind, was this vehicle ever under water.......even partially? Did you buy it new?
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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