My 2003 monti carlo engine will not turn over at all, radio quit too, i know it controls functions to the car too. I jump wired the starter, it turns over fine, starts, shuts down immediatly, security

The radio may have a blow fuse so leave that for the moment ,as you jumped the starter the problem would be in the ign system from the switch which i'd say will be to do with the security device you had fitted as i suspect the ign wire and fuel pump wire would also have been integrated into the system have you got the booklet that came whith the security device to see where the connections where made ? this will need an auto electrician to look at it i would think

Security Feature:Before anything mechanical 1st) You can try locking your car and unlocking it "WITH YOUR KEY" on the drivers door. if that doesn't work 2nd) Try turning key to on position and allowing it to sit in the on position for 10 minutes and 3rd) you can disconnect both negative and positive battery cables and use a vice grip or something of that nature to hold the 2 cable ends together for I believe 10 minutes. All 3 of these are known techniques for resetting the security feature.

Mechanical: I would have your alternator tested, but before that disconnect your starter and remove the cable running to your battery and thoroughly clean both ends of all the wires, you may want to bend them while you have them out may be some corrosion built up. if after you do this it starts and runs fine then you should replace the wire(s)

I hope one of these help you with fixing / diagnosing your problem.