How to Test a Car Amplifier with a Multimeter - Compulsory Guide

How to Test a Car Amplifier with a Multimeter – Compulsory Guide

A car amplifier is a piece of equipment that makes the sound system in a car louder. Most amplifiers have two channels, which are used to amplify the left and right stereo signals. A multimeter is an electronic testing device that can be used to test a car amplifier. To test a car amplifier with a multimeter, first, disconnect the amplifier from the power source.

If you’re a car audio enthusiast, chances are you’ve wondered how to test a car amplifier with a multimeter. While there are many ways to do this, we’ll show you one of the most popular methods.

First, make sure your amplifier is turned off and disconnect the power wire from the battery. Next, connect the positive lead from your multimeter to the positive terminal on your amplifier, and connect the negative lead from your multimeter to the ground terminal on your amplifier.

Now turn on your multimeter and set it to DC voltage mode. You should see a reading of around 12 volts. If you don’t see a reading, or if it’s significantly lower than 12 volts, then there’s a problem with your amplifier and it needs to be repaired or replaced.

How to Test a Car Amplifier with a Multimeter?

These days, vehicle audio systems are more intricate than ever before. If the days before you owned an older vehicle, you can picture those sweet single speakers placed on the dashboard. To test them was a matter of seconds. Today even if your eight-speaker sound system fails on you, you better have lots of patience. While the project may be annoyingly time-consuming, you’ll be happy you attended to it quickly after it occurs out of necessity.

How can you tell? Look at the handbook. If, nevertheless, that’s the case, evaluating the volume of your amp will inform you whether it’s adequate to complete the task. If it does, the device’s electricity will manage the sound and voice to see to it goes through to the speakers.

First, you’ll need to gather a few supplies. In addition to a multimeter, you’ll need an amplifier and a set of speakers. Once you have everything, hook the amplifier up to the speakers and turn it on.

Next, use the multimeter to test the voltage coming from the amplifier. You should see a reading of around 12 volts. If the reading is lower than that, there may be something wrong with the amplifier.

Configuring the Multimeter

A multimeter is a device that measures electrical current, voltage, and resistance. It is a useful tool for diagnosing electrical problems in a wide range of devices. This article will explain how to configure a multimeter for use.

Using the multimeter is not challenging just because you’re brand-new to it. The red probe needs to be inserted into the socket labeled COM, and the black one needs to be inserted into the socket named A.

The amperage socket is labeled A, and there’s one that is very sensitive and another that is high-amp enough. If you are not sure which socket to use, use the one that has the highest rating.

Turn the switch on the multimeter to the electrical capacity corresponding to the position of the socket. There may be a slight difference between the settings, but they accomplish the same goal.

Testing the Amplifier

The appropriate phase is identifying the amp.

It may be anywhere in the car, behind the steering wheel, behind the dashboard, and so on. The manual should have detailed instructions on where to find it.

It will tell you what wires to test, as well as what they should have if you check its wiring diagram. If your amplifier has more than one plug, you will need to check it over again and figure out the main one. It is usually labeled with 12V. It may be hot all the time or only when you drive the car. Turn the key to the ignition to find that out.

Problems are not always ideal, but if you handle them early, they will be an escape. The system may need to be turned off and the wires checked even if you think that it’s not working.

Tips and Helpful Advice

You should turn off the power before you connect your meter. It’s recommended to do so because the current will pass through quickly once the electrical power is on. A probe lead has a small size and gives few contacts, so all the current will flow through quickly when it’s on. Alligator clips are a suitable choice here. The high current can damage the probe due to the small contact surface.

If you attach alligator clips, the current is then spread to a greater extent over an area. The danger of damage is virtually nonexistent then. Of course, the power should be off while you attach them.

Issue #1 – The Amplifier Does Not Turn On

Verify the fuse in the battery box, as well as both ends. You can’t perform this diagnostic by opening it up. Sometimes, the fuse is bad, but not blown. You may need to change it, check the remote control line, or check the voltage at the amp terminal.

Issue #2 – Amp Goes On Into Protect Mode

Turn off the amplifier, then shut it down. When it still goes to protect mode, there is an issue. If the amp doesn’t go to this mode, reconnect the speakers. If it returns to protect mode, this signifies the speakers have a concern. It could be the wiring, too.

Issue #3 – Amp Goes On Without Output

Adjust all the settings, in addition to volume levels. Maybe an alternate source needs to be used to test your setup.

Issue #4 – Output Is Distorted

Hopefully, resetting the variables and trying all of the original settings will allow you to discover the logical issue. At that time you’ve got a problem! It’s likely that you’ll find it.

Issue #5 – Low Output from the Amp

Turn down the volume, then the subsonic filter, turn the volume up again, then do it again, make sure the radio is on, and look at the power leads as well. If the voltage drops at ampere terminals, the issue is with the speakers. If the voltage drops properly, the speakers might not work.

Issue #6 – Amp Goes On And Off

Ensure you run the electricity until the amp goes below 10V and confirm the voltage. If it goes under 10V, check your wiring.


However, if you’re a person of interest in the electronics and technology world, it is very simple to test the car amplifier, in addition to other things, with a multimeter.

Read more…

Bass Amp Vs Guitar Amp – What Are The Differences?

What is Digital Room Correction – Quick Guide

Related Posts