I have some kind of electrical problem cuz I can go underneath and cross the 2 terminals on the starter and the truck starts but I get nothing with the key. Any suggestions where I should look?

Sounds like starter contacts? Or starter relay in the PDC? Or the Starter relay fuse in PDC? Fuse D or Starter relay http://forum.mopar1973man.com/attachment.php?attachmentid=213 Gasser version of starter contact but the cummins is close to the same... http://forum.mopar1973man.com/showthread.php/693-Starter-contacts

Fuse D it was:hyper:

Glad it was a cheap fix for ya!