How accurate is AutoZone alternator test?

Before heading to the repair shop, I stopped by AutoZone on my way home. In 5 minutes, they hooked up their equipment and tested the battery load. They advised the alternator was toast – confirmed that with the repair shop the next day. Short answer – Yes, they’re accurate.

Can AutoZone test a bad alternator?

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

Can an alternator test good but still be bad?

The only way to know if an alternator is good or bad is to bench test it on an alternator test stand. … If an alternator can produce normal voltage and current during a bench test, the problem is not the alternator but something else on the vehicle.

Does AutoZone lie about batteries?

There are 2 ways for Autozone to test your battery. You drive the vehicle to them and they have a handheld tester that theyuse to test the battery in the vehicle. Depending on battery location you can get a false reading. If they cannot connect to the +/- post on your battery then it’ll give a false reading.

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Is there a diagnostic test for an alternator?

The other critical tool to effectively diagnose an alternator is a scan tool. On older vehicles, the battery light would turn on the alternator light when the alternator output or battery voltage dropped below a preset value. The battery light on modern vehicles, however, is controlled by data and trouble codes.

Can you test an alternator without removing it?

Many auto parts stores will test alternators, starters and batteries for free, though you will have to remove the alternator to have it tested at an auto parts store. Once connected to a terminal, an alternator should test between 12 and 13.5 volts.

What are the signs of a bad alternator on your car?

4 Symptoms of a Faulty Alternator

  • Car Won’t Start. A dead battery almost always lies behind a car that won’t start. …
  • Engine Stalling. A dead alternator almost always leads to a car that won’t start. …
  • Electrical Issues. A dying alternator can lead to a wide range of other electrical issues. …
  • Unusual Sounds.

Can an alternator fail without warning?

There are only a few ways an alternator can go bad, but they tend to happen suddenly without a lot of warning. Here are the common symptoms: Undercharging – This is the most common problem, and can often be caught in the early stages.

Will a bad alternator ruin a new battery?

Can a bad alternator kill a new battery? Yes, very easily. A failing alternator can overcharge, which will damage the battery. An undercharging alternator will leave the battery flat, which speeds up its failure.

How long does it take AutoZone to check a battery?

The Free AutoZone Battery Test Begins

After a couple of adjustments because the cables weren’t connecting properly with my battery’s positive and negative terminals, the test began. The whole reading took two to three minutes.

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How do you tell if it’s your battery or alternator?

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 you return a battery at AutoZone?

Warranties – Battery Limited Warranty (United States Only)

If a battery is found defective after the free replacement period, a credit towards the purchase of a new battery shall be made upon its return to any AutoZone store.

Are alternator tests accurate?

In 5 minutes, they hooked up their equipment and tested the battery load. They advised the alternator was toast – confirmed that with the repair shop the next day. Short answer – Yes, they’re accurate.

Can O’Reilly test an alternator?

Your local O’Reilly will test your alternator for free on or off your vehicle so you can know for sure whether or not that’s the problem with your vehicle.

Do alternators fail suddenly?

When your alternator begins to fail it can cause a variety of different electrical problems in your car, and eventually cause a breakdown. Alternators can go bad suddenly, or slowly over time.