I hope I can get some valid information here on the issue I'm having. I own a 2008 G35 Infiniti Sedan. I've had the car nearly 2 years. The alternator went out about a year ago. I had it replaced and the car ran fine then one day as I was changing the oil, I noticed that the bottom bolt on the alternator was loose. I made arrangements with the mechanic to take the car back and have the bolt tightened. On the day I was to take the car to him the alternator died again, or at least that is what I thought was wrong. The battery/alternator light started to come on while idling just days before, but would go off when I started driving.
I decided to replace the Alternator myself rather than take it back to the mechanic who changed it before for obvious reasons. After replacing the alternator, the battery won't charge at all and runs 20 mins or so or until the battery is drained and shuts off. I have replaced the battery twice, a new battery, the alternator three times only to be told that the alternator was fine when I took it back to the parts store.
The third and current alternator is an high output 250 Amp Alternator from an aftermarket vendor. [Could the aftermarket alternator be the problem?] At the urging of a trusted mechanic I have also replaced the ECU. Prior to replacing the ECU, there was an O² sensor code, following the ECU replacement now I get a mass air flow sensor, air temperature code, and a fuel temperature sensor code, none of which has anything to do with the charging system, battery or Alternator. in addition, the cooling fan does not seem to be working when the engine is running. I have replaced the Alternator fuse, and the fusible link as well. This problem has plauged me for 2 months now and i am unable to drive the car since it only runs on battery power.
Has anyone else had this problem and what did you do to fix the issue? I don't want to but I am seriously thinking of trading the car or just selling it. Any help would be greatly appreciated. I signed up here when the problem first started but am only now deciding to take time to post. Need Help......