Alright i have a 2009 chevy cobalt. Last year the alternator and battery were replaced. no problems. Recently ive noticed the battery light comes on in the morning. i drive it to the gas station leave it running 30-40 minutes later it goes off. it will come on periodically through the day but not as long as in the morning. I checked the volts the alternator puts out with my multi meter. ranged from 14.7 at idle to 14.83 at around 2000 rpm. seems high to me but let you be the judge. I did a diode check on new alternator its good. checked acid in new battery good. checked battery after car was shut off 12.7 volts. i let the car sit all night,, it starts right up no hesitation but battery light will come on i check voltage it is around 11.4 ish and after about 30-40 minute it jumps to its respective place around 14.7 again. I checked for a parasitic drain i had no luck. multi meter read 1.5 amps when placed in series i pulled the radio fuse dropped to around 150 Ma. let it sit all night same thing battery light on for 30-40 minutes then off runs great. i know the threshold for Ma is 50 Ma at rest i think the 1.5 was because the car was not asleep yet. I proceeded to blow the multi meter fuse by accidentally touching it to both terminals while on a Ma setting. I plan to buy a new one tomorrow to further investigate the parasitic drain. I was just wondering if anyone had any ideas on what it could be thanks.
