Good morning, quick check....Turn headlight on, see how bright they are.. If they are low or not bright at all... Then have someone try to start the truck, if light go out starter is not receiving enough voltage....
2. Now raise hood and grab the ground cable on your battery and pull hard, Have someone try to start again.... Be careful I bet it starts but if not, pull the Positive cable and repeat trying to start while pulling hard on it.... I think it is probably running.... If so you have bad connection, if not the battery is dead and needs recharge.... Once recharged it shall start but you now need to know if its charging, a different problem if you need help, just ask.... Peace of cake.... Rogerdog ( find the problem before we spend one dime)