04 Silverado Battery question
OK so i had a dead battery after getting it back from the auto shop from getting t-boned. So it wasnt driven daily for 2 and a half weeks so i think not keeping a constant charge on it finally ended its stock life. So i get a new battery, cool starts, drives, stereo works again sweet i think. So i get in the rush hour traffic and im idling and i see my battery light turn on then it shuts off. I coast off to the shoulder so i can put it in park and start it back up, starts up fine and i drive all the way home and have not had a problem since. I took it to Autozone had them test out my alternator everything passed. I bought a new alternator anyways a 145A becuase i always had a problem with my headlights dimming when i am playing my stereo.
I guess my question is why would a brand new battery die on me on the freeway in idle and then fire right back up like there is no problem?
All connections are clean and secure.