Cars run on electricity as well as gas, and almost all of it runs through fuses. Learn where they are, how to spot a blown fuse, and how to replace them.
Vehicles today have 40 or more auto fuses grouped in two or more places and usually vary from 10 to 30 amps. Usually located in or around the instrument panel near the dash, car fuses can also be found under the hood and even under the rear seat.
What is a car fuse?
Fuses are safety devices that protect electric circuits in a car from excessive current (overloading). Without a fuse an overloaded wire could melt or catch a fire. Each circuit has its own fuse. Several larger fuses with high Amp rating protect multiple or high-current circuits, such as electric power steering or radiator fan circuits. Automotive fuses are a class of fuses used to protect the wiring and electrical equipment for vehicles. They are generally rated for circuits no higher than 32 volts direct current, but some types are rated for 42-volt electrical systems. They are occasionally used in non-automotive electrical products.
How to check the main fuse of a car
All cars have at least one main fuse or fusible link. It’s usually installed at the positive battery terminal or in the fuse box, connected to the battery positive cable. Often the main fuse blows when accidentally touching the wrong battery terminal when boosting a dead battery. The symptom of the blown main fuse is no power and no lights inside the car. Checking the main fuse is easy, it’s usually clearly visible if it’s blown. If the main fuse blew, there is a chance that a few other smaller fuses are blown too.
What can cause a fuse to blow?
A fuse protects the circuit from higher current than the circuit can handle. If a fuse is blown, it means there is a short somewhere, whether between two wires or the power wire and the ground (car body).
There are some few common problems that causes blown fuses in many cars:
1. The most common case is when a metal object (e.g. coin) falls inside or a shorted accessory is plugged into the front accessory power socket (cigarette lighter socket).
2. The wire harness that goes into the trunk lid or liftgate breaks in the place where it bends, shorts and pops the fuse related to taillights or brake lights.
3. A wrong bulb installed in one of the headlights or taillights can also pop the fuse.
4. A damaged or rubbed through trailer harness shorts out.
5. A wiring harness that is connected to some component inside the engine bay rubs through and shorts the fuse. In some older Mercedes-Benz cars, for example, it was a fairly common problem when an insulation on the engine wiring harness cracks shorting the wires and popping the fuses.
Where to buy a Car fuse
Having a blown fuse can be devastating, nevertheless it can be replaced. Banggood is an online store where you can purchase a high quality fuse for your car at affordable rates.
Before pulling out any fuses, it’s important to remember that this type of work should only be performed by a qualified individual or qualified business. Working with your vehicle’s electrical system can be dangerous both to you and your vehicle. If all of this is new to you and you don’t feel confident working with your vehicle’s fuse box, I recommend that you consult a professional!