How to Inspect Car Fuses

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A fuse is a low-resistance resistor device that protects a circuit from becoming overloaded. It is a short piece of wire that is designed to melt and break apart when exposed to an excess of electrical current. A fuse is connected in series to the circuit it protects.

A blown fuse usually causes an electrical short or an overloaded circuit. The most common fuse to burn out in a car is the 12v power outlet, also known as the cigarette lighter. This is often caused by leaving a cell phone charger in it for a long time, or because of the occasional stray penny that falls into an exposed power outlet.

A fuse box is located in the car and houses the fuses. Some cars have multiple fuse boxes with many different fuses. If something electrical in your vehicle suddenly stops working, start by checking the fuse box and get a certified mechanic to take a look and diagnose any electrical problems.

Part 1 of 4: Locate the fuse box

Materials required

  • Flashlight
  • Needle nose pliers or fuse puller
  • Test light

Most cars have more than one fuse box - some vehicles may even have three or four. Car manufacturers tend to install fuse boxes in different locations depending on the make of the car. It is best to refer to your owner's manual to locate the fuse box you need, and also to determine which fuse controls each circuit.

fuse box locations table

Part 2 of 4: Visually inspect fuses

fuse box being pulled out by person

Most fuse boxes will have a diagram displaying the name and location of each fuse.

Step 1: Remove the fuse. With the car completely off, locate the fuse in question and remove it by grabbing it firmly with the fuse puller stored in the fuse box, or with a pair of needle nose pliers.

good fuse side by side to bad one

Step 2: Inspect the fuse. Hold the fuse up to the light and check the metal wire for signs of damage or a break. If you see either of these, you will have to replace the fuse.

Part 3 of 4: Use a test light

If you do not have a fuse diagram to locate a specific fuse, you can test each fuse individually with a test light.

Step 1: Switch on the ignition: Turn the key to position two on the ignition, also known as Key On, Engine Off (KOEO).

person inspecting fuse with test light

Step 2: Inspect the fuse with the test light. Attach the clip for the test light to any bare metal, and use the probe of the test light to touch each end of a fuse. If the fuse is good, the test light will light up on both sides of the fuse. If the fuse is bad, only one side will illuminate the test light.

  • Tip: Use a computer-safe test light, preferably one with an LED light, as probing unknown fuses with an older style test light may draw excessive current. If you test a fuse for the airbag, it may deploy - so be careful!

Part 4 of 4: Replacing the fuse

Once the damaged fuse is detected, be sure to replace it with a fuse of the same type and amp rating.

  • Tip: Fuses are sold at any auto parts or hardware store or dealership.

Identifying and replacing a damaged fuse on your own can save you time and money. However, if the same fuse is blowing repeatedly or if certain electrical components are not working, it is advisable to enlist a certified mechanic to inspect the electrical system to identify the reason the fuse keeps blowing and replace the fuse box or fuse for you.


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Damian

10 years of experience
403 reviews
Damian
10 years of experience
Chrysler PT Cruiser - Electric Problems - Sanford, Florida
DAMIAN SHOWED UP EARLY AND WAS VERY COURTEOUS AND PROFESSIONAL.I WAS VERY IMPRESSED WITH HIS ELECTRICAL KNOWLEDGE. HE FOUND THE PROBLEM WHEREAS ANOTHER MECHANIC SAID WE SHOULD JUNK THE CAR. THANKS DAMIAN
Ford Escape - Electric Problems - Palm Bay, Florida
Damian was very professional and courteous, he explained everything that he was doing. Found the door lock had corrosion and fixed it in a very timely manner. Will recommend him to friends and family.

Chris

21 years of experience
1676 reviews
Chris
21 years of experience
Toyota Camry - Electric Problems Inspection - Garden Grove, California
I am happy with Chris recommendation, he also was professional, friendly and he also was early the appointment.
Volkswagen Super Beetle - Electric Problems - Murrieta, California
Chris Allshouse offered me an earlier appointment which I accepted and it helped to free up my afternoon. He quickly diagnosed my problem and set about resolving. He offered valuable information that would allow me to troubleshoot a problem before it arose. I couldn't be more pleased. I would rate Chris a 10 out of 10. Thanks gain Chris!!

Joe

42 years of experience
715 reviews
Joe
42 years of experience
Land Rover Range Rover Sport - Electric Problems - Tampa, Florida
I couldn't be happier with Joe. Joe is professional, knows his stuff, and is very thorough. I am going to use Joe again, you can bank on that.

Erfan

6 years of experience
20 reviews
Erfan
6 years of experience
Acura TL - Electric Problems - Redmond, Washington
Erfan is great. He notified me right away when he knew that he would be late due to delay from previous work. He is professional and honest. He only charged for what he had done, and he patiently explained to me what was wrong with my car. I highly recommend him.

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