Your Infiniti is outfitted with all the modern electrical accessories that make driving enjoyable - but that electrical demand can wear out your Infiniti alternator. Diagnosing a failing Infiniti alternator can be a tricky business, since often the car can run without any problems until the alternator dies completely - and then the car does not run at all. When the alternator begins to fail, the car might run off the battery's stored energy, until the battery dies. One sign: the charge indicator light (or 'idiot light') comes on, although that may also represent a faulty fuse in the system, and not a bad alternator. You can check the voltage at the alternator connector and other connections in your electrical system with a voltmeter to measure the voltage. Or, listen for a distinctive grinding noise that comes from the alternator's bearings. All of these may be signs that your Infiniti alternator has been finally been worn down by the demands on the car's electrical system. When one of components of your Infiniti alternator begins to fail, it is recommended that you replace the Infiniti alternator as a unit, instead of trying to diagnose and replace each part as they fail. Order your Infiniti alternator unit here, and replace it yourself - and save on repair bills.