try checking the mega fuse if it is a Ford,or for chevy,the inline fuse found by the alt and lastly the inline fuse on the fire wall for a mopar you may have a bad battery or it needs charging before you can use it unusual but happens could have been on the shelf too long
Try a new battery, or get a jump start. Sometimes there is not enough power in the battery to start the engine.
Possibly the alternator is defective and not recharging the battery. Or something is on, pulling power from the battery when the car is not running. Can be any light or any relay that is stuck.
Buy a new battery or call someone to jump your battery
If the battery is defective get a new battery. If you just left something on and ran it down, charge the battery and keep going.
You more than likely have some light that is staying on pulling power from the battery. Can also be a stuck relay.
jump start the car and get a new battery and if it isn't the battery it could be the alternator or both, but try a new battery first
Check ignition relay. Jump the battery directly to the starter and see if the starter is any good.
make sure your battery is charged, check the battery cable connections, get your starter and alternator checked, then ask a mechanic. then push it off a cliff and buy a new oneif you have to cars use thebattery from the car that works and use that for the car that doesn't workIf you have some power for other accessories, try a jump start & then check alternator when you get it going.
Either the electrical flow between the battery and the switch is faulty or the connection between the switch and the blower is faulty. Could be an inline fuse.
You can get a new battery, you can jump start the car with jumper cables and another car with a charged battery. You can also put a battery charger on your battery to give it a charge.
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As long as the alternator works and your charging system is correct, the new battery will start your truck and keep it running.