Automobiles rely heavily on electricity to start and to power many of the car’s accessories. Although it’s an inconvenience when the radio doesn’t work, being unable to start your vehicle can leave you stranded. Your alternator is responsible for recharging your battery and powering your electronics while your car runs. So, if you think this part is going bad, you may be searching how to test for a bad alternator. Instead, bring your vehicle to the experts at Havoline® Xpress Lube of Kernersville.
How Do You Know You Have A Bad Or Failing Alternator?
Your car’s alternator is part of the electrical system, generating electricity to recharge your battery and power accessories. Typically, it’ll last about 7 years or between 80,000 to 150,000 miles. Often, a failing alternator will work intermittently resulting in a dead car battery. If your alternator is starting to fail, you may notice one of the following signs:
- Frequent Stalling
Some cars have electrically controlled fuel injectors. Without proper fuel delivery, your engine can stall.
- Unusual Sounds
The most common parts to wear are the internal bearings. When they wear, resistance and friction increase resulting in a whining or grinding noise.
- Dashboard Light illuminates
Automakers equip modern vehicles with dashboard indicator lights to let you know there is a problem with your engine. Depending on your manufacturer, this light may look like a battery or have the letters “ALT” or “BATT”.
- Malfunctioning Accessories
Often, you’ll notice dimming headlights, flickering interior lights, or entertainment centers that periodically shut themselves down.
- Car Starting Problems
Your car battery is responsible for giving your starter a jolt of electricity to get the engine going. If you have a bad or failing alternator, you could end up with a dead car battery.
How To Test For A Bad Alternator
Of course, no one enjoys getting stranded on the side of the road with a vehicle that won’t operate. Thus, if you suspect you have a bad or failing alternator, you probably want to know how to test it.
One way to determine if there is a problem with your charging system is to use a multimeter. This device measures voltage, resistance, and current. Using a multimeter, follow these steps:
- Turn off your car.
- Set your multimeter to voltage.
- Press the probes/leads to the corresponding battery terminals, negative to negative and positive to positive.
- Check the multimeter reading. It should read between 12.5-12.8 volts.
- Next, start the engine.
- If the multimeter shows increased voltage, your alternator is probably good
Unfortunately, this test can’t test the health of your alternator. Furthermore, it can’t check other components that can interfere with the battery receiving a charge. For example, a blown fuse can also prevent the battery from charging. Thus, without further investigation, you could end up changing a fully functioning alternator.
Alternator Or Dead Car Battery
Oftentimes, it can be hard to know whether the problem lies with the alternator or the battery. Both parts are part of the electrical system and exhibit similar symptoms when going bad. Sometimes you know it’s time to replace the battery. Usually, car batteries only last 3-5 years. Additionally, upon examination, you may notice corrosion on the battery terminals.
If you notice something isn’t right, bring your car to Xpress Lube. Our technicians will look at your engine, perform diagnostics, and let you know where the problem lies. We always take time to thoroughly explain your options so you can make an informed decision. Along with our fast and friendly service, we offer competitive prices.
How To Test for A Bad Alternator – FAQs
Experiencing car problems? Waiting can cost you more in repairs or worse, getting stranded. Below, we answer a few commonly asked questions related to how to test for a bad alternator.
Is It Safe To Use The How To Test Your Alternator Without A Multimeter Method?
If you search the internet you may come across some articles on how to test your alternator without a multimeter. This other process involves disconnecting a battery lead while the car is running. Although years ago, it was possible to do this, today you may damage electronic components.
Can I Jumpstart A Car With A Bad Alternator?
Generally, you can jumpstart a car with a failing alternator. However, you’ll only have a minimal amount of electrical power. If you continue to drive, you’ll deplete the battery again. Additionally, cars with electrical power steering may become more difficult to control. Moreover, driving with a faulty alternator can damage other components that rely on electricity.
How Much Does It Cost To Replace My Alternator?
Typically, your vehicle’s make, model, and year will help determine the cost. For example, automobiles have different electrical connections, mounting styles, and amperage requirements. Additionally, automakers design engines differently. Sometimes the alternator is on top with easy access, other times it’s underneath the engine making it difficult to reach.
Usually, most mechanics will also recommend changing the serpentine belt, tensioner, and idler rollers when replacing the alternator. The serpentine belt is a long rubber band connecting the engine crankshaft to accessories including the alternator. Over time, the belt can crack and fray and if it breaks, can also leave you stranded.
Why take a chance on your car quitting when you need it most? Taking some time to address car problems now can save you headaches and money later. The pros at Havoline® Xpress Lube of Kernersville are waiting to assist you! Call us at 336-993-7697 or make an appointment using our easy online form.
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