Automotive Electrical Diagnosis: Tips And Tricks For 2023

MJC Auto Electrics
MJC Auto Electrics from


As we enter the year 2023, the automotive industry continues to evolve, and so does the technology behind it. One of the most important aspects of modern cars is the electrical system, which is responsible for powering the engine and various other components. However, diagnosing electrical issues can be challenging, even for experienced mechanics. In this article, we will provide you with some tips and tricks for automotive electrical diagnosis.

Understanding the Electrical System

Before we dive into the diagnosis process, let’s take a moment to understand how the electrical system in a car works. The battery is the heart of the electrical system, providing power to the starter motor, which turns the engine over. Once the engine is running, the alternator takes over, generating electricity to power the various components, such as the lights, radio, and air conditioning.

Detecting Electrical Issues

When it comes to diagnosing electrical issues, it’s important to first identify the symptoms. These may include dimming lights, a weak starter, or an intermittent electrical system. Once you have identified the problem, you can begin the diagnosis process.

Diagnosis Process

The first step in diagnosing an electrical issue is to perform a visual inspection of the battery and alternator. Look for any signs of corrosion, damage, or loose connections. If everything appears to be in order, you can move on to testing the battery and alternator.

Testing the Battery

To test the battery, you will need a voltmeter. The voltmeter should read around 12.6 volts if the battery is fully charged. If the reading is lower than this, the battery may need to be replaced. If the battery is not holding a charge, it may be a sign of a faulty alternator.

Testing the Alternator

To test the alternator, you will need to use the voltmeter again. With the engine running, the voltmeter should read around 14 volts. If the reading is lower than this, it may be a sign of a faulty alternator.

Other Electrical Components

If the battery and alternator are functioning properly, but you are still experiencing electrical issues, it may be a sign of a problem with other electrical components, such as the starter motor or ignition switch. These components may need to be tested or replaced.


Diagnosing electrical issues in a car can be challenging, but by following these tips and tricks, you can save time and money by identifying the problem quickly and accurately. Remember to always perform a visual inspection first and to use a voltmeter to test the battery and alternator. By understanding the electrical system in your car and how to diagnose issues, you can keep your car running smoothly for years to come.

Leave a Comment