Hey so how do i know if my Alt is bad??? i went to start my car and i thought everything was good...when I backed out of the drive way I noticed that the headlights were a little dim but I thought nothing of it cause the car ran fine a few hours earlier...anyway as i was driving up the street to leave my neighborhood i noticed the radio was going off and on...I thought this was weird....so i shut the car off and looked under the hood saw nothing out of place nothing looked disconnected or broken so i shut the hood and went to start the car back up..it cranked sooooo slow then fired up and shot stright up to 2500 rpms and then dropped to 950rpms then started to surge....what do you think it could be???