How To Check Car Fuses? [A Beginner’s Guide]

A fuse is a low-resistance resistor that prevents an overloaded circuit. It is a little wire which melts and breaks off if exposed to electricity overload. The circuit it safeguards is coupled with a fuse in series. Usually, an electric short or overloaded circuit is caused by a blown fuse.

The 12-volt power supply, usually known as a cigarette lighter, is the most frequent fuse in an automobile. This is commonly caused by the long-term leaving of a cell phone loader or by the occasional stray cents in an exposed power outlet. Learn how to check car fuses in this article.

What Causes Blown Fuses In Cars?

Defective wiring or engine electricals might lead to an increased current flow, causing a blown fuse. Default switches can lead to short-circuits. Fuses can all be blown by other electric elements, such as heat and cooling blower motors, power seats, electric fuel pumps, or air conditioning systems. Here are the main causes-

1. Wiring Defects

Wire isolation fraying. If one of the wires is broken and exposed, the metal frame or the floor may touch, which will cause a short circuit. The wire may move a lot and come into contact with a surface sometimes and cause intermittent shorts. This is still plenty to blow a fuse.

2. Faul In The Car Electrical System

The electrical components and wire system for your vehicle are protected with automotive fuses. A short time high current flow will simply cause a fuse to blow in the electrical system instead of the cable melting. A short is only a bad link between two electricity supplying drivers, which causes an electrical excess in the circuit.

3. Bad Modules In The Car

Electric equipment is not working properly is a major cause for the blown fuses. Internal damage to your windshield wiper or power locking components can lead to more flow than normal being used by these systems to stay running. The circuit is overloaded so that it becomes short.

How To Tell For A Blown Fuse?

Take the holder off the fuse. In some instances, it may be necessary for you to remove the cap from a little screwdriver. See the wire of the fuse. If there is a visible gap between the wire or in the glass, the fuse will be blown and it must be replaced. The fuse will then be blown.

If you make a visual inspection and look for a break in the thin wire, a homeowner can tell whether a glass fuse blown has blown in the middle of the fusion. 

How To Check Car Fuses?

Cars do not utilize modern circuit breakers, so you should know how to check car fuses. These fuses sometimes need to be tested to ensure they still function well. Fuses may be tested by multimeter and can be learned quickly and easily. The steps are as follows-

1. First Locate The Fuse Box

More than one fuse box is used in most cars – there are even 3 or four in some vehicles. Car manufacturers tend, depending on the car making, to set up fuse boxes. You should consult your owner’s manual to discover the fuse box you need and determine which fusion controls each circuit. 

2. Use Visual Inspection First

Find the fuse box and take it by holding the fuse puller located in the fuse box or with a pair of nose needles. When the vehicle is entirely off, remove it. Keep the fuse in place and inspect for evidence of damage or a break in the metal wire. You will have to replace the fuse if you notice either of these.

3. Checking Fuse With A Test Light

You can test each fuse individually with a test light if you have no fuse diagram to find a particular fuse. Switch the key to position two, commonly called Key On and Engine Off, on the ignition. Put the clip on any unknown metal for the test light and use the test light probe to touch each fuse end.

The test light on either side of the fuse lights up if the fuse is good. If the fuse is faulty, the test light only shines on one side. Use an electronically secure test light, preferably one with an LED light, because it can draw excessive current to test unknown fuses with an earlier type of test light. When testing an airbag fuse, it can be implemented – take caution!

4. Using Multimeter To Test A Fuse

While the element is a glass fuse that can be easily visually checked to see whether it has blown, most fuses have solid non-transparent bodies hiding the element from view. While learning how to check car fuses, you need a multimeter to test whether the fuse is blown. Once set up, the resistance of the fuse element can be measured by a multimeter.

The dark lead should have a common socket connection. The iv or the ohms socket should have a red lead. If the reading of the multimeter shifts to a low resolution (similar to the result of touching the 2 leads together). If there is no change in the meter read and the display shows the original, then the fuse is bad.

What If Fuses Are Constantly Blowing?

A fuse is a protective circuit that prevents wires from melting in the automobile. The higher the ampere, the more heat will be there, the more the current goes through the cable. There will be too much heat to melt wires and even a fire. Because of the short circuit, the only reason a fuse will “bust” is a point where a cable connects directly to the earth.

If more current attempts to pass the cable than it can handle, the fuse will explode at that moment to prevent harm to the cable. If this happens very often then inspect your vehicle as soon as possible. It can lead to a fire!

How Much It Costs To Check Fuses?

It will cost you nothing if you can do it yourself. The fuses are easy to locate and can be easily serviced at home. If there is an electrical issue, so fixing that could cost up to 500$.


So learning how to check car fuses in a car is a pretty easy job and you can do it very easily, it can even save you from future damages. If you still have any questions, then comment down below.

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