How To Fix A Blown Fuse In Car

How To Fix A Blown Fuse In Car – Fuses are safety devices that protect the vehicle’s electrical circuits from excessive current (overload). Without a fuse, an overloaded cable can melt or catch fire. Each circuit is protected by its own fuse. A few large, high-amp fuses protect multiple or high-current circuits, such as power steering or radiator fan circuits.

There is also at least one main fuse. A fuse removal tool is also usually located in the fuse box or fuse box cover.

How To Fix A Blown Fuse In Car

If any electrical component in the car is malfunctioning, the first step is to check the fuse that protects the circuit with that component. Modern cars usually have two fuse blocks: one under the hood and one in the cabin. You can find the fuse map in the owner’s manual or on the cover of the fuse box. There are several ways to test fuses. It is easiest to pull out the fuse and visually inspect it. you can find instructions in your vehicle’s owner’s manual. How to visually check security

How To Fix A Blown Fuse

For example, the cigarette lighter socket, also known as the front accessory socket, stopped working on this car. We will check the security. On this vehicle, the interior fuse panel is located directly above the driver’s side panel. We found a fuse puller tool in the fuse box in the engine compartment.

Turn the key to the OFF position. Before pulling the fuse, it is always a good idea to mark its location so that you can install it in the same place. We take the tool and use it to pull out the fuse. As you can see, the fuse (on the right) has blown. Fuses have a thin metal conductor inside that melts when the current exceeds the fuse’s rating. In this blown fuse, the conductor melts.

When a fuse blows, something has shorted the protected circuit. If the problem is not resolved, the fuse will blow again. On this car it was a small screw that fell into the front cigarette lighter socket. The replacement fuses on this vehicle are also located inside the fuse box cover in the under hood fuse box.

When replacing a fuse, use only the correct type of fuse. It’s a 15A fuse, it’s blue on most cars. Some types of fuses, like these low-profile mini fuses in the photo above, are common and can be purchased at any auto parts store. Larger fuses or panels with multiple fuses may need to be ordered from the dealer. How to check the main fuse

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All cars have at least one main fuse or fuse. It is usually installed on the positive battery terminal or in the fuse box connected to the positive battery cable. Often the main fuse blows if you accidentally touch the wrong battery terminal while boosting a dead battery. Checking the main fuse is easy, it is usually visible if it has blown. If the main fuse has blown, chances are that several other smaller fuses have also blown. How to test a fuse with a multimeter

If you have a multimeter, there are two ways to test a fuse. The first way is to measure the voltage on both pins (blades) of the fuse. Small car fuses have the top of both pins sticking out of the top of the fuse, see photo. This allows you to measure the voltage on each side of the fuse without pulling it out.

Set the multimeter to DC (direct current). Connect the COM terminal (black) to the negative terminal of the battery or to a metal part attached to the frame or body of the vehicle. Apply the parking brake and turn on the ignition. The ignition must be on because not all fuses work when the ignition is off. Using the positive probe, check for voltage on both sides of each fuse. A fuse is simply an electrical conductor. If both sides show 12 volts, the fuse is good.

If there is 12 volts on one side of the fuse and not on the other side, the fuse is blown.

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If one side shows 12 volts and the white side shows no voltage, you have found a blown fuse. This method works well when multiple fuses need to be tested at the same time. Some engineers use a power probe instead of a multimeter. The power sensor lights up when there is a voltage of 12 Volts. How to check the resistance of a fuse with a multimeter

In the photo on the left, the fuse is blown, the multimeter reads OL, which means there is no continuity or the resistance is greater than can be measured. In the right photo, the fuse is good, so the multimeter reads 0 ohms or ohms. Click on image to enlarge.

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If you have already pulled the fuse, but it is not clear whether it has blown or not, you can check its resistance. Resistance is the opposite of current. The lower the resistance, the greater the current. Resistance is measured in Ohms or Ohms. A conductor such as copper or aluminum wire has a very low resistance (close to 0 ohms). A good fuse will read 0 (or close to 0) ohms, see the image is on the right. In other words, there is continuity between the two pins (blades) of the fuse. A blown fuse will show very high resistance (infinity), see picture on the left.

To measure the resistance of any electrical component, it must be disconnected from the electrical circuit. You cannot measure electrical resistance while the component is connected or powered. Set the multimeter to ohms and connect the leads as in the photo. What can cause a fuse to blow? A fuse protects a circuit from more current than the circuit can handle. If a fuse blows, it means there is a short circuit somewhere between two wires or between the power wire and ground (car body).

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A fuse can also blow if a component draws more current than it is rated for. For example, if the wiper motor or fan motor seizes up when it is on, it will draw more current and possibly blow a fuse. The same thing can happen when the winding is shorted inside the motor. We have noticed some common problems that cause fuses to blow in many vehicles:

1. Most often, a metal object (such as a coin) is dropped or a component short is connected to the front accessory socket (cigarette lighter socket).

2. The wiring going into the trunk lid or liftgate breaks where it bends, shorting and blowing a fuse associated with the taillights or brake lights.

5. A wiring harness attached to a component inside the engine compartment erases and closes the fuse. In some older Mercedes-Benz cars, for example, it was a fairly common problem where the insulation in the engine wiring harness would crack, shorting the wires and blowing the fuses. In electronics, fuses serve as protective mechanisms to prevent overcurrent that can damage an electrical circuit. A fuse is usually a metal strip of wire that melts or burns when too much current is passed, thereby interrupting the flow of electricity and breaking the circuit in a given device. A car has many such fuses to protect various electrical components from exposure to high voltage. These fuses are generally rated for 32 volts and are located in one of the two fuse blocks of most vehicles.

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When a vehicle component stops working, the cause is usually a blown fuse due to excess electricity. This can apply to everyday driver interface devices such as a car stereo or interior lighting, but can also include more complex electrically powered systems: electronic transmissions, electronic chassis, safety features, driver assistance technologies and passenger comfort features. If a failure occurs, the faulty fuse must be identified and replaced. Replacement fuses can be found online and at almost any auto parts store.

A blown fuse indicates a short circuit. This occurs when an electrical component draws more current than it is designed for due to a device malfunction. Faulty switches and bad wiring are common causes of blown fuses, but any mechanical problem with the motor or electrically driven moving part can be to blame. For example, a windshield wiper stuck under ice can cause the engine to shut down. In this case, the blown fuse prevents the engine from overheating and burning, which would be much more expensive to replace than the fuse.

For common breakdowns such as lighting, power seats or air conditioning, checking the fuse is a logical first step in solving the problem. But for more complex vehicle mechanical systems, it is recommended that the car owner investigate the cause of the blown fuse as it may indicate a larger problem that may continue to worsen even after the fuse is replaced. Contact a certified mechanic or dealer service department

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