How to Test the Alternator with a Screwdriver | 8 Steps by Expert

How to Test the Alternator with a Screwdriver

It is a simple question on how to test an Alternator with a screwdriver, but as you start to look deeper into it, you’ll find that several things can affect how you try an alternator. The vehicle consists of an alternator. It is an essential part of the vehicle to charge the battery. However, the alternator comes in two types, namely permanent magnet and brush type. This blog gives information regarding the testing of an alternator with the help of a screwdriver.

How to Test the Alternator with a Screwdriver 

How to Test the Alternator with a Screwdriver

Step By Step Guide To Test Alternator with Screwdriver

Testing Alternator with Screwdriver

We’ve now taken a look at the whole process of how you can test alternators with a screwdriver. It’s effortless to accomplish once you understand the diverse strategies for trying an alternator.

Insert Key in Ignition

Let’s not skip over the steps now. The primary thing you need to do here is take your keys out of the ignition and turn your key to the accessory position. There should be a key slot where you’re able to insert your car keys and leave them in a while, also locking the door of your car, allowing you some time to check out the battery if this style of car assessment appears like something that involves you, then, by all standards, the range for it!

Safe a Car Hood

If you have meant to take care of your car regularly, you should learn how to pop the hood to provide you with easy access to your engine. The latch is present in the front part of your car, which you can release and pull down gently on the end of the latch.

Once the hood is in place, use a rod and secure it on the inside of your hood. The rod assists if too much stress affects any part of your hood either by opening or closing it and even when intense wind pressure is against it.

Open Car Hood

Opening your hood when dealing with inner car issues may arrive at the answer by simply examining the alternator close to the engine.

Check the Alternator

Check the alternator inside the car engine. After fining, insert the screwdriver close to the alternator pulley bolt. It does generally place in the frontage of the alternator.

Turning the Key to Position On

Most car engines have sensors that will turn the ignition off when there’s something wrong with the machine. To check this while you’re turning on the engine, but your car won’t start, turn on the dashboard lights and increase their brightness to maximum.

If your dashboard lights begin to flicker rapidly as this happens, sensors are working correctly, and you’ll want to look at other factors before continuing. 

In case, at any point you do not succeed in checking your device, continue checking it to see if your devices still function correctly. If there is rust on them and they are no longer working correctly, try combing the device’s metal parts with sandpaper or another abrasive substance to remove any corrosion so that you can use your voltmeter without worrying about an improper result. If you don’t have a new voltmeter handy, try cleaning the metal parts of your device with sandpaper or another abrasive substance and go for the testing procedure once more. 

Get the Screwdriver Close To the Alternator 

You need to look at your car manual to determine how to turn on the key for your battery. Then, place your screwdriver close enough so that its metal tip can reach the nut where it attaches to the alternator without completely unscrewing it from the pulley.

If you view that your screwdriver pulls towards the alternator, it’s working correctly. Nevertheless, if it isn’t drawing to anything, your alternator has something wrong, and you need to locate the problem as soon as possible. As we can see from the original example, a few grammatical errors are left uncorrected.

Protection Guidance

  • Make confident the ignition is out, and your keys are out of the ignition. 
  • Make specific the barrage cables are detached.
  • Grab a screwdriver and turn the ignition.
  • Make confident the motor is not running

Frequently Asked Questions

How Can You Quickly Test An Alternator?

It can accomplish by checking the battery voltage. When the battery voltage is under 12.6 volts, the alternator isn’t producing enough power for the vehicle. When a person inspects a battery, they should also pay attention to any corrosion buildup on the terminals and any leaks in the case of a wet-cell battery.

How Do I Test My Alternator Manually?

There are several ways to test an alternator manually. One way is to use a voltmeter to measure the alternator’s voltage with the engine running. A healthy alternator should put between 13-14 volts at 3000 RPM on its own. Alternators can also test by attaching them to an external battery and seeing if they provide the same output as the battery.

How Do I Test My Alternator To See If It’s Working?

If there is an electrical problem with the vehicle, the alternator will not produce enough power to recharge the battery. It can result in a storm that does not maintain adequate voltage output and may lead to a dead battery. If you suspect that your alternator is no longer functioning, consult a professional mechanic for diagnostic services.

Will The Car Start If The Alternator Is Bad?

If the car’s alternator has failed, it will not start, as it cannot generate power for the starter. The alternator is an instrument that transforms rotational power from the motor into electrical energy to assess the battery and other car electrical procedures.


At last, here are many ways to test your vehicle’s alternator. The most effortless method is to operate a circuit tester unrestricted at most auto regions accounts. If you want to buy an alternator or have one installed, make sure that the coils are not touching each other when it is in place and that they’re correctly grounded when the alternator is in use.