So I changed my oil and after I was finished I tried to turned the car on and it wouldn't start and the Check Gauge light comes on . I thought maybe the starter went out so I changed it , put the new one in and still the check gauge sign comes on and it wont start. I went out and bought a new Alternator and nothing it clicks but it wont start. Battery is a NAPA brand and I bought it about 3/4 years ago fully charged. Any ideas whats going on ? I plugged the Stanley car battery charger and it still says alternator is bad ?