Other Category problem
1983 BMW 320 4 cyl Two Wheel Drive Manual 180000 miles
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So, im trying to get my baby up and running again. I just had a new alternator put in b/c i thought the old one was bad. B4, i had to get my battery charged everycouple of weeks. After i had the new alternator put in, i bought a brand new battery that lasted me roughly 3hours!! I have no idea what the problem is! Any suggestions?!

There is something drawing the battery down. Is there aftermarket stuff(alarm, stereo or amp, non stock items) installed? Remove the loads and charge the battery, then test the charging system and perform a key off draw test.(use an ammeter in series with the ground lead of the battery) The draw should not exceed 50ma.
If you do not understand how to do these things, it may be necessary to seek local professional help.