3309081 - E1010 SUPPLY - Description

Description

The entire electrical system has been designed and constructed in accordance with the most up-to-date guidelines concerning safety and protection, especially against fire risks.

There are two main kinds of protection:

• active protection, aimed at reducing possible causes of faults 'at source';
• passive protection, aimed at minimizing the effects of a possible fault.

The first kind involves the thoughtful design of wiring, attentive to location and anchorage, and the careful planning of properly protected cable routes. Modifications have therefore been made to the alternator and starter motor cables, with the adoption of protective caps, etc.Passive protection instead includes all the interventions, which have always been adopted on vehicles, to reduce high fault currents (overload and short circuit).All the fuses included in the system have been rated on the basis of the nominal absorption of the loads which cannot be served simultaneously, and so as to ensure intervention in the case of a definite short circuit.All the electrical systems are supplied by the battery at a voltage of 12. V. The battery is in turn recharged by the alternator during engine operation.  See E5010  STARTING AND RECHARINGThe main supply lines are protected by maxifuses, grouped together in a box directly on the positive battery terminal and connected directly to it.

The box contains the following maxifuses, named according to the circuits protected:

• CVM engine compartment junction unit supply
• CPL main junction unit under dashboard supply
• CVB luggage compartment junction unit supply

The power supply to the terminal board to the starter motor and the alternator is interrupted by the SCB device for the MAXIFUSE box on the battery if the interia switch is operated.  See E5010  STARTING AND RECHARINGSome circuits are supplied continuously, even if the vehicle is stopped and the ignition is off, as they are connected directly to the battery.

Other circuits are supplied by turning the ignition key to various different positions:

• when the key is inserted and turned to the first click, the ignition is turned on (MAR position) and several circuits are supplied, which are thus called 'ignition-operated' (lines 'INT' and '15/54');
• the second click - AVV position - instead supplies the starter motor; (line '50')., disconnecting some circuits (those which absorb most power), thus ensuring the maximum flow of current to the starter motor; ('INT/A' line).

The lines through which the supply is distributed to the various electrical devices are shown on the wiring diagrams relating to the various functions and systems.

This general diagram shows all the lines which depart from the battery and the MAXIFUSE boxes; reference should be made to the specific diagrams for greater detail.

The power supplies for all the services and systems are protected by special fuses, in the three junction units:

• one inside the passenger compartment CPL, the main junction unit;
• one in the engine compartment on the left side panel CVM, engine compartment junction unit;
• one in the luggage compartment on the right side panel CVB, luggage compartment junction unit.

The lines through which the supply is distributed to the various electrical devices are shown on the wiring diagrams relating to the various functions and systems.

This diagram shows all the lines which depart from the battery and the MAXIFUSE boxes; reference should be made to the specific diagrams for greater detail.