Fuses in the cabin and engine compartment

Numerous fuses protect the on-board electrical equipment in your Focus from overload. Their protective function is precisely calculated on the basis of the theoretical maximum load of the individual electrical circuits. The fuses immediately interrupt the current supply if, for example, in the event of a short circuit (faulty consumer, damaged wire) on-board voltage is dissipated to ground inconsistently. This prevents them from causing other damage (e.g. ignition of wires) in your vehicle. Your Focus is equipped with flat-wire fuses that blow a fusible wire when overloaded. However, the fact that the fuse is overloaded also occurs when an already fully loaded electrical circuit is burdened with additional consumers, such as high-quality sound reproducing equipment, amplifiers or powerful, unauthorized lamps that are not approved. Car vacuum cleaners and coolers that simply plug into a cigarette lighter socket can also blow a fuse. Therefore, if necessary, equip your Focus with a separate electrical circuit for additional consumers, install the appropriate fuses. To eliminate all possible failures, let a specialist in automotive electrical equipment do this work, who will stretch the wires with the desired cross section (minimum 1.5 mm²) and thus protect the outlet.

On-board fuses are distributed in different electrical circuits

In order to ensure that your Focus does not turn out to be completely de-energized in case of any defect in the electrician, Ford engineers distributed electrical consumers into different electrical circuits. Engine management and most powerful units have their own protection. The so-called auxiliary consumers are combined into different groups and in each case are switched on via a fuse. This is not the case with the electrical circuits between the starter, battery, alternator and ignition switch: they have full battery voltage at all times. Therefore, when working on such electrical circuits, special care is required: «ALWAYS» disconnect the battery first! Otherwise, major damage and wire fires are simply programmed up to the fire of the car.


Focus brackets are equipped with so-called flat plug fuses. Two flat connectors are inserted into a transparent synthetic part, connected by a fusible wire. You will recognize a blown fuse by a broken fusible wire. Often the back of the plastic shell is also broken or melted.

You will determine the strength of the current by color

In order to make it easier to determine the maximum load, the fuses are color-coded in addition to the inscription.

Blue	(15 A)
Yellow	(20 A)
light green	(30 A)
Red	(10 A)
Brown	(7.5 A)
Blue	(20 A)
Orange	(40 A)
White	(25 A)