What Does It Mean If Your Alternator Light Comes On When Driving?

by | Last updated on January 24, 2024

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What does it mean if your light comes on when driving? Basically, the light indicates a battery charging problem. If the light comes on and stays on while driving, this means that

your alternator is running solely on energy stored in the battery

. If you continue driving, your battery will eventually drain and your vehicle will stop working.

How long can I drive with the alternator light on?

But how long can you drive with a broken alternator? We have researched this question and this is what we found. You should only drive

25 miles or around 30 minutes

with a bad alternator if you have a fully charged and properly working battery. If your battery is low, you may need to be towed.

What should you do if your alternator warning light comes on?

Can you drive a car with a bad alternator?

How do you know if your alternator is bad while driving?

What does an alternator cost?

How much does an alternator cost depends on the type of vehicle. In some models, they can run as low as $180 and for premium , they can run over $1,000. The

average cost is approximately $500

.

How do I know if my alternator is draining my battery?

A battery test is easy to perform and can be done at home. First, open the hood and start the car. While the engine is running, remove the negative cable from the battery.

If the vehicle stalls or dies, the alternator is likely bad

.

How do you check if your alternator is working?

A simple test to check the working of the alternator is by

running your car; and then unplugging the positive connection of the battery

. If the car stops, then you most likely have a problem with the alternator. Another simple test is to check your interior lights.

What can damage an alternator?


Driving a vehicle through water that is deep enough to splash or flood the alternator

can damage the alternator shaft bearings and possibly the brushes and electronics inside the unit as well. Water can also cause corrosion that over time will damage the wiring and bearings inside the alternator.

Do alternators fail suddenly?

When your alternator begins to fail it can cause a variety of different in your car, and eventually cause a breakdown.

can go bad suddenly, or slowly over time

.

How long will bad alternator last?

Is it worth replacing alternator?

How do I know if I need a new alternator or battery?


If your engine won't turn over or takes far longer than usual

, it's time to grab the jumper cables and attempt a jump-start. If your engine starts and stays running but won't start again later, it's likely a battery problem. If your vehicle immediately stalls, it's probably a bad alternator.

Can AutoZone check my alternator?


Every AutoZone in the USA will check your alternator, starter, or battery at no charge

.

What causes an alternator to fail?

Alternators have a number of moving parts, so

as they get dirty and are subjected to extreme temperatures, those internal components can wear out

, causing the alternator to go bad. One of the most common problems you're likely to experience with an alternator is a failure in the bearings.

Can I fix my alternator?


Rebuilding an alternator is a fairly simple procedure, which anyone with basic automotive knowledge can accomplish

. Although the construction of some brands will vary slightly, the basic anatomy of an alternator consists of the same components.

How do you check a car alternator?

Can a bad alternator ruin a battery?

Will a bad alternator drain your battery?

What happens when alternator goes out?

If a faulty alternator fails to keep your battery consistently charged,

the fuel injectors may not fire, causing your engine to stall

. A dying alternator can lead to a wide range of other electrical issues. Generally speaking, such issues manifest as an inability to perform at normal power.

How often does alternator need to be replaced?

Will a failing alternator throw a code?

HOW TO DIAGNOSE A FAILING ALTERNATOR. If you have a “Check Engine” light on, connect a code reader to the diagnostic port.

If you find code P0562, you very likely have a failing alternator

(note that codes may vary by vehicle make/model/year). Get it checked out before it fails entirely.

Can you jump-start a car with a bad alternator?

How much does it cost to replace a bad alternator?

When your car starts having electrical problems, it's a sign you need an alternator replacement. Considering the price of a new alternator as well as labor, you should expect to spend anywhere

between $500 and $1,000

to get a new one for your vehicle.

Can AutoZone replace an alternator?


You can bring the vehicle to AutoZone and have the alternator tested on the vehicle to ensure the charging system is performing correctly

. Some of these steps may vary slightly depending on your exact year, make, model, and engine.

How far can you drive without alternator?

If the alternator output was weak for a long time before it failed, the car may not go very far. If you have a fully charged high capacity battery, you could drive

a hundred miles

at least in the day-time, on the battery alone.

How long does a failing alternator last?

How far can you go with a battery light on?

Basically, if you see the battery light on in your car when it is running, you shouldn't expect to be able to drive it for very long. Think of it like unplugging your cell phone from your wall charger.

If you leave it plugged in, your phone will last indefinitely on 100% charge

.

Do alternators fail suddenly?

David Evans
Author
David Evans
David is a seasoned automotive enthusiast. He is a graduate of Mechanical Engineering and has a passion for all things related to cars and vehicles. With his extensive knowledge of cars and other vehicles, David is an authority in the industry.