See also:

Ford Sierra Service Manual
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Body electrical system
General information and precautions General information The electrical system is of the 12 volt. negative earth type. Electricity is generated by an alternator, belt-driven from the crankshaft pu ...

Road test (Every 12 000 miles (20 000 km) or 12 months)
Instruments and electrical equipment 1 Check the operation of all instruments and electrical equipment. 2 Make sure that all instruments read correctly, and switch on all electrical equipment in ...