A Non-Starter (Alternator Problems in Cold Weather)
February 20, 2022
As the temperatures dip, we all know there could be problems starting our vehicles. After all, batteries can grow old and not hold a charge as well as when they were newer. Or starters can go bad. But there's one more component to keep an especially sharp eye on during winter: your alternator.
The alternator is sort of like a small generator. It sends power out to various parts in your vehicle that need electricity. That includes the battery, which needs charging to keep its power topped off. The alternator creates electricity by taking mechanical energy from the engine and turning it into electricity. It is connected to the engine by belts and pulleys.
In cold weather, the material the belt is made from is less flexible than it is in warm weather. That means it may not be turning the pulleys as effectively since it doesn't have the same grip. Also, when it's colder, lubricants, including the engine oil, are a little stiffer and parts just don't move like they do when the weather's warmer. With that extra strain, sometimes it takes the alternator longer to recharge the battery. That, in turn, may leave the battery a little less power to start the engine when it's cold.
You may have a warning light on your instrument panel that looks like a battery. If it lights up or if you notice your headlights flickering or not shining quite as brightly as they usually do, it could mean a weak alternator. But it also could be an aging battery, corroded battery terminals, a loose belt or another charging system part. Yes, it's complicated.
Pinpointing the cause involves testing the battery and charging system with diagnostic equipment. If it does turn out to be an alternator, there are options besides replacing it with a brand new, original equipment part. Ask your service advisor for recommendations. Obviously, you want your vehicle to start reliably, especially in cold weather. Take care of your charging system and it will take care of you.
Gary Knurek GoodYear
1973 Livernois
Troy, Michigan 48083
248-362-0350
Need Service?
More articles from Gary Knurek, Authorized GoodYear Dealer
Control Arms: Small Part, Big Impact
July 19, 2026
Heres one part of your vehicle you may never have heard of: the control arm. Its the part that connects the wheel hub and steering knuckle to your vehicles frame. What it does is lets your wheel move up and down while keeping it aligned with your vehicle. Most control arms have things called ... More
No Shake, Just Smooth
July 12, 2026
When your vehicles wheels are out of balance, theyll likely give you some clues. Your steering wheel might shake, the floor or seat vibrates and you might find your vehicle pulling to one side. Other signs? Your tires might wear unevenly and may make odd noises. Plus, fuel economy might not be ... More
Stop Right There!
July 5, 2026
Your vehicles brakes are only as good as its master cylinder. This part is truly is the heart of your braking system, because if it isnt working the way it should, the rest of the brake system cant either. The master cylinder is what takes the pressure you put on the brake pedal and ultimately... More