Car trouble

I have a '94 Grand Prix , new alternator and no electrical shorts that I can find , but if I leave the battery connected something drains the battery and I have to give it a jump the next time I want to go somewhere , what could be the cause ?

You might just need a new battery. Have yours tested.

I have a new battery , and the one I just replaced was new , now its junk .

Have you tried putting an ammeter on the battery and pulling fuses until the load goes away? I think I would try that first. See if you can narrow it down to a particular circuit.

Did you fully charge that new battery when it was installed?

guess I dont have a lot of choices so Ill try that

yes , when I put the battery in the car , I started the car and let it run for about 30 minutes