I think my alternator is shot on my 01 dc2 gsr. my car will idle at 2-400rpm, engine wont die tho, and my digital voltage readout shows that its running at 12.4 volts. seems to happen only at idle. and when im at idle, ill rev to 4k rpm, then it will shoot back up to 14v and then ill let go on the throttle it will go back to 12 volts. problem doesent seem to occur when im driving since it shows 14v. this happens maybe every 1/3 times i stop. the other times i idle at 600rpm showing 14v. problem is slowly getting worse. is my alternator shot? a direct replacement of my alternator fix the problem?