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Do you hear any sounds when you try to start it?
A single click or rapid clicking?
Do you have the key fob to turn the alarm off?
Ok, well it seems like the first thing we have to do here is try to get the alarm to stop going off.
Close the hood with the battery connected and the alarm going off. Then lock and close the doors, then unlock the door with the key. Hold the key in the unlock position on the door for about 10 seconds and see if the alarm then is off when you open the door. This should reset the alarm so you can make an attempt at starting the truck
let me know.
this should disable the alarm, try it on the passenger side of the truck. All the doors have to be locked when you do this.
That sounds like maybe an aftermarket system. Did the vehicle start once you disabled the alarm?