04 acura tsx not charging
 

Hi so ive been having some charging issues. i first replaced the battery. the car would charge for about 3 min at 14v and all of sudden it dropped to 12.2v running on just the battery. I checked all the battery fuses under the hood and other fuses under the steering column, they all checked out ok. There is also no lights while running like check engine or battery lights. was looking for the ELD but cannot locate it on this model. went on to replace the alternator. still no charge. checked wires and continuity and they all checked out ok. what am i missing?. any help is much appreciated thanks