What are common symptoms of alternator failure?

What are common symptoms of alternator failure?

If your alternator is malfunctioning, your battery is liable to become drained to the point that you can't get your car to start. At the first indication of alternator failure, you'll want to be proactive about taking care of the problem. Here are six symptoms of alternator trouble.

Dead Battery

A new car battery should have a lifespan of at least three years, if not a lot longer. A failing alternator could be to blame if your battery dies sooner than this---as long as you're sure you didn't leave your headlights on!

Warning Light Illuminates

A faulty alternator can trigger a dashboard warning light that reads ALT or GEN. In some vehicles, this light will instead turn on in the shape of a little battery. Whenever a warning light comes on, you'll want to make an effort to identify the underlying issue.

Problems with Electrical Accessories

Newer vehicles regularly have computers capable of calculating which electrical accessories should first be powered down when the alternator isn't working properly. This way, power is conserved for the car's greatest electrical needs, but could cause problems with accessories like power seats.

Trouble with Headlights

A malfunctioning alternator can cause headlights to act erratically. If your headlights begin dimming or flickering, this creates a significant safety concern, especially if you have to navigate nighttime roads that aren't illuminated by streetlights.

Belt Issue

If you're concerned that your alternator may not be working properly, then it's worth doing a quick visual inspection. If a belt is cracked, too loose, or too tight, then you may have spotted the cause of your alternator trouble.


A failing alternator may prevent a sufficient amount of power from being directed to spark plugs. This could then cause the engine to stall.

If you need auto repair, be sure to bring your vehicle to a reputable mechanic. For alternator replacement & auto electric repair in Manchester, Pinardville, and South Hooksett, NH, contact the experts at Phil and Son Auto Repair at (603) 669-6827. Feel free to give Phil and Son Auto Repair a call today to make an appointment for any of your vehicle's repair or maintenance needs!

Phil and Son Auto Repair Blog
Posted: May 2, 2021

Written and Published By MORBiZ