Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Did you have a dealer reset the idle position when you replaced the throttle body, and do you have a meter to test the output of your charging system?
first I would verify the charging system output, you can grab a volt ohm meter at harbor freight for about 5$. These alternators will frequently fail if trying to charge a bad battery. Unlike old alternators these are really only designed for maintenance charging. Since it currently isnt starting however i would check your fuses since you have been jumping it, if you see no problems then try tapping on your ignition switch as contact sometimes fail.