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A fuse is the weakest point of an electrical circuit. When an excessive electric current flows through a circuit, the fuse gives sacrifices to kill itself to protect the circuit.
A fuse can blow after a particular time without any apparent reason. But, a blown fuse doesn’t always mean a short circuit or faulty component. Sometimes a momentary surge of an electric current can blow a fuse. Moreover, a fuse may blow due to a minor defect, such as running multiple accessories simultaneously.
While figuring out the electrical fault, the hardest part is where to start. The first thing you should remember while fixing an electrical problem is to check a blown fuse.
A blown fuse is easy and cheaper to fix and replace than an electrical component. You can easily detect and change a blown fuse safely in less than five minutes with pictures. It’s very easy, it’s not rocket science.
On this page, you will learn how to detect and change a blown car fuse with seven easy and quick steps in less than five minutes with pictures.
How To Change A Fuse In A Car
Before you change the fuse, first use your intellect to make sure, if the fuse has really blown, or the problem is in the component. To know, if the fuse has blown, check the signs, does the component spontaneously stopped working. For example, the wiper motor suddenly stopped working while operating back and forth, or the washer pump stopped working while pumping water to the windscreen.
These are the signs that indicate the fuse has blown. Sometimes, a blown fuse can be caused by a faulty electric component that draws too much current or due to a short circuit. When an electric component slowly gets worse, it indicates the electric component is faulty. Here is how to replace a car fuse.
7 Quick Steps To Detect & Change A Blown Car Fuse Safely
Below is the step-by-step procedure for diagnosing and fixing a blown car fuse.
Step 1. Find Out The Fuse Box Location
The first step is to find out the location of your car’s fusebox. Have a fusebox diagram to locate the fusebox. Or your car owner’s manual can help you locate them. Most cars have two fuse boxes. First under the hood and second under the dash or side kick panel.
Step 2. Detect A Blown Fuse
Now you have found out the fuse box location, it’s time to detect the blown car fuse. You can find out the blown fuse related to an electrical component by looking at the fuse schematic.
Usually, the fuse schematic is printed inside or outside of the fuse box cover. Or you can use the car’s owner’s manual for finding out the electrical circuit’s fuse diagram. You can also test the fuse to detect the blown fuse. The procedure is explained in the below point.
Step 3. Test The Fuse Before Removing
Before removing the blown fuse from the fuse box, it is better to test the fuse to diagnose the blown fuse. You can test the fuse by an ohmmeter or by continuity test.
You can also test the fuse with a test lamp. Put the negative pole of the test lamp on the body frame, and the positive pole, on the fuse terminals one by one. If the test lamp flashes in both terminals, it means the fuse is ok. If the test lamp flashes in one terminal and not in another terminal, it means the fuse has blown.
Step 4. Remove The Blown Fuse
Once you figure out the blown fuse. Now it’s time to remove the blown fuse from the fusebox. You can use a fuse puller or pliers to extract the blown fuse by pulling the fuse upward while slightly wiggling the fuse.
Mistake To Avoid:
Before you remove the fuse from the fuse box, make sure your car’s ignition switch is turned OFF. Do not remove the fuse or change the fuse while the key is in the ignition.
Mistake To Avoid:
Be careful while removing the blown fuse, it can break and pieces can stick into the fuse box.
Step 5. Replace The Fuse With A New One
Now once you have removed the fuse, now it’s time to insert the new fuse into the fusebox with the same color, size, and amperage rating.
Mistake To Avoid:
Remember, never replace a fuse with a different amperage rating than the original one. It can cause an electrical fire. Always replace the fuse with the same color, size, and amperage rating.
Step 6. Check The Electrical Circuit
Start your car and check the electrical circuit. Sometimes, a temporary surge can blow the fuse. If the electrical circuit is working, it means you successfully solved the problem. As you have seen detecting and changing takes a few minutes. Personally, I detect and change a blown fuse in less than a minute.
If a car owner tells me, the horn does not work, within one minute I figure out the blown fuse. Because I know, mostly the horn fuse is located under the hood’s fuse box, I remove the fuse box’s cover, find out the suspected fuse, and replace it with a good fuse.
Step 7. Fuse Blows Again
If in case, the fuse blows again soon after you replace it. It may be due to shorted electrical wiring, faulty electrical component, etc. Then check for wiring or electrical component to find out the exact problem.
Repeatedly blowing the same fuse, is a sign of a bigger underlying problem that needs the vehicle to be further diagnosed.
An In-Line Blown Fuse Change
Some accessories have in-line fuses, such as aftermarket accessories like fog lights, aftermarket window central locks, which are not factory installed. The in-line fuses can be located near the battery or under the dash. To find an in-line fuse is to trace the wire from the accessory to the dash. You can open the fuse housing and replace it.
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