Contents: Relay operation ↳ Relay location ↳
The Fiesta is equipped with a number of consumers that consume a higher current than other consumers. To ensure maximum safety with the smallest possible wire cross-sections, these consumers are supplied via separate relays. When using a relay, the switch only switches small currents to turn on the relay in relation to the current required to turn on the consumer itself.
Relay operation
A simple relay is used to control an electrical consumer with a large consumption current. If voltage is supplied to such a consumer through long electrical circuits, the voltage will drop sharply. In addition, the switch contacts must switch large current values. When the corresponding consumer is turned on, the switch electrical circuit closes and supplies voltage to the relay coil. Under the influence of voltage, the relay coil, overcoming the force of the spring, attracts the plate, which closes the relay contacts and turns on the consumer's electrical circuit. The consumer's electrical circuit reduces the voltage drop, since it passes through a short path, connecting directly through the relay contacts to the consumer.
Relay location
Fig. 15.41. Location of the relay on the back of the fuse and relay box under the instrument panel
Fig. 15.44. Location of relays in the fuse box and relays in the engine compartment
In the Fiesta, most relays are assembled into blocks and mounted on special mounting boards (Fig. 15.41, 15.44, Table 15.5, 15.7). The on-board network also includes additional relays that are located near the consumer and perform certain functions. These include the turn signal relay, windshield wiper relay, and preheating relay for the diesel engine.
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