General information and precautions

The body electrical system consists of all lights, wash/wipe equipment, interior electrical equipment, and associated switches and wiring.

The electrical system is of the 12 volt negative earth type. Power to the system is provided by a 12-volt battery, which is charged by the alternator (see Chapter 5).

The engine electrical system (battery, alternator, starter motor, ignition system) is covered separately in Chapter 5.

Precautions
Warning: Before carrying out any work on the electrical system, read through the precautions given in “Safety first!” at the beginning of this manual, and in Chapter 5.

Prior to working on any component in the electrical system, the battery negative lead should first be disconnected, to prevent the possibility of electrical short circuits and/or fires.

    See also:

    Routine maintenance and servicing
    Ford Sierra maintenance schedule The maintenance intervals in this manual are provided with the assumption that you will be carrying out the work yourself. These are the minimum maintenance interv ...

    Throttle housing - removal and refitting
    Note: A new gasket must be used on refitting. Removal 1 Disconnect the battery negative lead. 2 Depressurise the fuel system as described in Section 6. 3 Remove the air inlet pipe (see illustrati ...

    Sump - removal and refitting
    Note: A new gasket and new sump bolts must be used when refitting, and suitable sealant will be required (available from a Ford dealer). Note that it is preferable to keep the engine upright until ...