Back to all

The Power Behind your Engine (Alternator Diagnosis and Repair)

May 26, 2025

There's nothing like that sinking feeling when you turn the key and nothing happens in your vehicle.  A lot of us are quick to blame the battery.  But it may instead be your alternator that's failing.

Your battery supplies power to start your vehicle, but the alternator is what sends power when your engine is running.  The good news is alternators last a fairly long time, and it's not unusual to get seven years out of one. But they can give up the ghost thanks to the harsh conditions in the engine compartment.

Alternators have bearings inside them that keep things turning smoothly.  Debris, liquid, dirt and more can team up with the high temperatures your engine generates to cause those bearings to seize up.  That's not good, and if that happens, you may even be able to hear the bearings grind.

Other symptoms of a dying alternator are a squealing noise in the engine compartment or your headlights may go dim and bright, dim and bright.  You might even notice an electrical smell.  Any of these signs warrants a trip to your service facility.

Here's something else to think about.  If your alternator's bearings have seized up and the unit's shaft is not turning freely, that can destroy the belt that's attached to it.  So don't be surprised if your service advisor says both parts have to be replaced. 

There are different grades of alternators you can buy, but consider just how important this part is to keep your vehicle running.  Your service advisor will give you options based on your driving style and vehicle.  Remember, if you notice any of those symptoms that may signal a failing alternator, have it taken care of before you wind up stuck somewhere at the side of the road.

Tuffy Clinton Township
19535 15 Mile Road
Clinton Township, MI 48035
5867926660

More articles from Tuffy Clinton Township

If You Drive Like a Maniac (Aggressive Driving is Bad for a Vehicle)

June 9, 2025

When someone mentions driving like a maniac, they're not talking about you, surely? Besides the safety issues of aggressive driving, you should know that your vehicle will last a lot longer if you'll just mellow out a little. Here are four traits good drivers follow if they want their vehicles t... More

What is a TSB? (Technical Service Bulletins)

June 2, 2025

If your vehicle had something in its design or production that the manufacturer had figured out had an unanticipated problem, you'd want to know about it. And you'd want it fixed. There is something that can help drivers with just such a scenario. It's called a Technical Service Bulletin, or TSB.... More

In the Hot Seat (Repair and Maintenance of Seat Heaters)

May 18, 2025

It's chilly outside. You flip on that switch that looks like a picture of a seat with little heat waves rising from it. You expect soon you'll feel that warmth but wait! It's not getting warmer. Oh no, what's wrong with my seat heater? There could be lots of reasons it's not working, and it cou... More