Fuses in the passenger compartment and engine compartment (Fiesta 4)

In the Fiesta, fuses are used to protect electrical circuits from overloads and short circuits. If additional consumers of electricity are connected to the electrical circuit or a short circuit (which is nothing more than an excessively increased current flow) occurs due to a fault, the electrical circuit is overloaded. If the current exceeds a certain permissible value, the fuses simply interrupt the current flow. In this way, they prevent damage to the car, such as a wire fire. The Fiesta is equipped with flat fuses, in which the fusible thread burns out in the event of an overload. The fuse also performs its function when already fully loaded electrical circuits are overloaded by additional consumers, such as modern music systems, speakers and unacceptably powerful lamps. Vacuum cleaners and refrigerators that you plug into the cigarette lighter can sometimes cause the fuse to burn out. If necessary, equip the car with a separate electrical network for additional electrical equipment and install a fuse accordingly. To avoid possible unpleasant consequences, contact a car electrician who will lay the necessary wires (with a cross-section of at least 1.5 mm²) and install the necessary fuse.

Protection of various electrical circuits

To ensure that your vehicle does not lose all power in the event of an electrical fault, Ford engineers have distributed consumers across various electrical circuits. Engine management and most powerful components have their own electrical circuit. Secondary consumers of electrical power are grouped into various electrical circuits, each of which is protected by its own fuse. Only the circuits connecting the starter, battery, generator, and ignition switch are not protected by fuses: here, the full voltage of the battery is constantly present.



WARNING

Be especially careful when working with electrical circuits: always disconnect the wires from the battery terminals first! Otherwise, serious damage and ignition of the wires, including a fire in the car, are inevitable.



TECHNICAL DICTIONARY

Fuses used in the Fiesta car

So-called flat fuses are inserted into the fuse holders. Two flat contacts are fused into a transparent plastic housing, connected to each other by a fusible conductor. You will recognize a blown fuse by a torn fusible conductor. Often the back side of the plastic housing is damaged or melted.

Color of fuses

The current value (A) is indicated on the back of each fuse. The color of the fuse also corresponds to the value of the protected current.

Fuse color Current, A

Purple... ...... ...... ...... ...... ...... ....3

Brown... ...... ...... ...... ...... .....7.5

Red... ...... ...... ...... ...... ...... ...... ...... ....10

Blue... ...... ...... ...... ...... ...... ...... ...... ....15

Yellow... ...... ...... ...... ...... ...... ...... ...... ....20

Transparent... ...... ...... ...... ...... ...... ....25

Green... ...... ...... ...... ...... ...... ...... ...... ....30