What Does an Alternator Do? An alternator works with your battery to charge your vehicle’s electrical systems. An alternator that’s going bad can affect your car in many ways. There are several signs you need to watch for that may indicate your alternator is bad. Also, read – Car Alternator Functions and Symptoms of Failure 1: Flickering Headlights It Still Runs states that dimming headlights is one of the first signs that your alternator is starting to malfunction. If you notice that as you increase or decrease the speed of your engine that your headlights will grow brighter and dimmer, this is a red flag. An alternator that is in good working condition will maintain bright headlights no matter what … Continue reading 5 SIGNS OF A BAD ALTERNATOR