If everything appears fine, the alternator should be removed and bench tested, which can be done for free at AutoZone. Pricier models may offer more features, and some well-known brands are also just around the corner, but you can still get the same essential functions with a cheaper brand. Alternator magnetic test Because the alternator works based on electromagnetic, we can do an alternator magnetic test as a way to test an alternator without a multimeter. The best bet when it comes to electrical issues is to check out the alternator if the battery is not the source of your problems. This is NOT a safe test and you are doing it at your own risk, this is especially true if you disconnect the positive terminal first. Checking for a Bad Diode. If the weather is too cold or your battery has significant wear over time, the battery could be the real issue, and your alternator might not even be a problem. Konstantin is an electrician and TV repairman by profession. A multimeter’s Diode Test mode produces a small voltage between test leads. There’s also another way to check the alternator manually. Check the voltmeter, and it reads more than 12.2V, your battery has enough power to perform testing. This magnetic test is used to check the effect of the electromagnet produced from the rotor and stator components inside the alternator. Turn your ignition into ON position (do not start) and touch the alternator pulley with a metal object like a wrench Locate your alternator and check to be sure the alternator belt isn't loose. Take the red lead and position it at the battery terminal on the positive (+) side. If your engine is running and there is a problem with your alternator, you may actually be able to hear a squealing sound. Whenever you find your car battery out of steam, you think immediately about a bad alternator. Below are some alternator tests and clues to look for if you don’t have a multimeter handy: If you just got a brand new battery and your car is not starting, then you definitely have a faulty alternator on your hands. The next step is to load test the alternator to see if it can hold up under heavy usage. Well, let’s assume that you are in a situation without any electrical measurement devices available, and definitely don’t have a multimeter handy, can you check it anyway? You might have heard of the multimeter or voltmeter test, but not many drivers know how to test alternator with screwdriver, which is very simple and useful without the need to buy a voltmeter. If the battery light on your dashboard is always showing that there is a problem with your battery, that could mean that it is not being charged. It is turned by a serpentine belt. If you see higher readings, chances are the alternator is good. ElectricProblems.com is a participant in the Amazon Services LLC Associates Program which is an affiliate advertising program that is designed to provide a means for sites to earn advertising fees by linking to Amazon.com. In you want to learn how to test alternator with screwdriver, then follow these steps: Please insert vehicle key on the ignition switch without starting the engine. The battery stores enough voltage to be able to start the engine without the assistance of an alternator. Stores for car parts and accessories are accepting alternators to test for free. One is the battery and charging system tester while the other is the voltmeter. Below we will discuss how you can do so with or without a voltmeter. The information contained in this website is meant to be as accurate and current as possible, but mistakes happen (you can always visit the corresponding link or manufacturer’s website for exact details and the latest updates). 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