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How to Test an Alternator

10,827,812 views October 29, 2014 9:06

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ChannelChrisFix

In brief

You’ll learn to diagnose alternator issues using a multimeter, checking voltage while the car runs to confirm whether it’s charging properly or failing. This is useful for anyone dealing with weak starts, dim lights, or a car that dies unexpectedly.

Questions & answers

What voltage range indicates a healthy alternator?

A good alternator reads 14.2–14.7 volts while running and doesn’t drop below 13 volts under load.

Description from the creator

Diagnosing Alternator Problems. Learn how to test an alternator with a Multimeter. Does your car not start, do you have dim headlights or interior lights, does the starter sound weak when start the engine, or does your car die sitting overnight? This video will show you a few ways to test your alternator to see if it is bad, is going bad or is good. A good alternator will show a charge at around 14.2-14.7v while the car is running and under an electrical load it wont drop below 13v.

Here is a great multimeter for under $20: amzn.to/3sy10xH

Test your Battery: youtube.com/watch?v=COJr7OB23Hw
Check for Parasitic Draw: youtube.com/watch?v=n5FJDgcdii8
Top 10 Mistakes Car Owners Make: youtube.com/watch?v=gkn-K2noClw

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Disclaimer:
Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.

About this tutorial

ChrisFix published this 9:06 video tutorial on October 29, 2014. It has been watched 10,827,812 times on YouTube.

Channel
ChrisFix
Duration
9:06
Published
October 29, 2014
Views
10,827,812
Likes
176,901

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