truck wont stay running

[63longfleet]

I hope someone on here has a idea of what is wrong here. I can start my truck it will idle just fine for a bit then die. After it dies it acts as if the Bat is dead ( no power at all). if you let it set with the key on for just a few min it slowly comes back to life, the "bell" starts off real quiet and just like turning up a radio it get louder till normal. then the truck will start again and start the process all over again. Thanks for any and all help, its my work truck and i cant have it down for long.