I have a 2003 SSEI and am experiencing a new issue with the car. When I got the new engine in the car I put a battery from one of my Grand Nationals in it. Everything was fine for over 2000 miles. My fiance left her door open and the car went dead overnite.. I jumped it the next day and all seemed just fine. It went back up to 14+ volts. The following day it dropped to 11.9... I said screw it and ordered a brand new alt and went and bought a brand new Battery. I put the battery in ....same....today the alt came in and I installed it....same! Any ideas? This is driving me nuts!