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Do you have a test light or volt meter so we can do some testing?Which engine is in it? Also, is it an automatic or manual?
Does it make any sound at all when you attempt to start it?Clicking at the starter or anything or just silence?
First, check the 50 amp maxi fuse under the hood it should be #5. Remove it and make sure it's not blown. If it is, then the truck won't get signal to the starter. This would prevent it from cranking,but also might cause it to not start when you jump the starter with the ignition on.
If that fuse is fine, this may be a problem with the neutral safety on the side of the transmission. This will prevent the engine from cranking if the truck doesn't know it's in park. Sometimes putting the truck in neutral will allow the starter to crank.
Please check the fuse and let me know.
Thats not a foolproof test for the neutral safety switch since it uses the same wiring in neutral as it does in park. Sometimes we get lucky and it will start, but it's by no means proof the switch is good. Let me know on the other.
We need a test light to check the wiring at the neutral safety switch or at the ignition switch. If the check engine light comes on when you turn the key on, then I think the ignition switch would be good.