5 Symptoms of a Bad Alternator in Your Car


The alternator is an important component of a modern automobile. There are so many electrical systems and components in new vehicles which need to be powered. The alternator is the component which charges these electrical features with power. If it wasn’t for the alternator, there wouldn’t be enough power available to charge these electrical components.

A lot of people forget this important fact and just assume the battery charges everything. The truth is that a car battery only provides the electric current needed for the starter motor to start the engine. Once that happens, the alternator takes over and supplies power to all the electrical systems. It powers things like the headlights, air conditioner, power windows, radio, and so on.

More importantly, the alternator powers the engine and engine control unit as well. Remember, modern vehicles have electrical components in just about every area of the car. All the sensors and computers which exist in a vehicle run on electricity. This is power in which the alternator provides them.

Read also:

5 Bad Alternator Symptoms

Like a battery, the alternator slowly wears out over time. The more you use your vehicle, the more worn out the alternator becomes. Alternators last anywhere from 2 to 5 years on average for most people. You never know when your alternator is going to go bad, but there are warning signs that you can look out for. It is easy to confuse these warning signs with the signs of low battery power. That is why we’re going to outline the specific symptoms of a bad alternator.

Below are the top 5 symptoms of a bad car alternator.

1) Dimming Headlights – If you’re driving at nighttime with your headlights on and you notice the headlights starting to dim, then it means your alternator is going bad. The alternator is the main power source of the headlights, so do not think it is your battery that is going bad. You should immediately stop driving until it is daytime again just to be safe. Then take your vehicle to the auto shop and have them replace the alternator.

2) Car Won’t Start – When the alternator goes bad, all the electrical components of the vehicle will draw power from the car battery. Even if your car battery is new, your vehicle won’t make it around the block if the battery is the only thing powering its electrical components. All the power gets drained out of the battery when there is a bad alternator. As a result, the battery won’t be able to provide an electric current to the starter motor when you try to start your engine. That means your car won’t start.

3) Warning Light – A warning light will illuminate on your dashboard. You should see the letters “ALT” light up to indicate that the alternator is the problem. Although, some vehicles have the letters “GEN” instead. You’ll most definitely see the battery warning light come on because of the alternator’s effect on it.

4) Electrical Components Stop Working – Since the alternator provides power to the electrical components of the vehicle, you may notice these components are not working so well. For instance, if the air conditioning is failing to blow out air or the radio doesn’t turn on, these would be indicators of a bad alternator.

5) Weird Noises – The alternator has a lot of spinning components inside of it. These components produce the necessary electric current to power all the other electrical components of the vehicle. As the alternator goes bad, some of its own spinning parts may get damaged or worn. This will cause them to make weird grinding noises. They may also be whining noises too.


1 comment

  1. Brenda G Parks 24 May, 2019 at 19:36 Reply

    ford explorer 1997. HELP After driving vehicle for lets say 30 miles, stop, turn off engine. when I go to restart the car, it will try to start but it will not turn over. If I wait 15 minutes or so then try to restart, then it will start. Have replaced starter.

Leave a reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.