The truck was running great got home then after 6 hours i went back out to the truck and went to open the door the alarm went off i didn't lock the truck.

i have tried taking the battery cables off for 30 mins. i have tried unlocking and locking the doors with the key and with the fob. and im still having no luck with getting the alarm to stay off when im opening the doors and the truck wont start anybody got any idea's.

 

As weird as it sounds, try a new battery.

 

Try putting the key in the ignition (keep in off position). Now go unhook battery then turn key to on position. Re conect battery carefull might get some sparks.

I believe somethin in that order worked for my Blazer after my battery died and I no longer had the remot for the alarm.