Starting - operation

When the alternator outputs a voltage equal to that supplied by the battery, the warning lamp is extinguished as the potential difference across the lamp is 0 volts. The diode between the alternator and warning lamp prevents reverse flow.

The regulator functions as an electronic control switch on the earth side of the field coils. The regulator rapidly switches the earth circuit off and on to control the generated voltage and current to safe limits.

If the battery is in a low state of charge or current draw from the electrical system is high and causes a voltage drop, the alternator charges at its maximum rate until 14 volts is generated. As battery voltage rises, the generator current output reduces.

STARTING - OPERATION

Feed from the positive battery terminal is connected to the engine compartment fuse box (C632-1) by a brown wire. Fusible link 2 (C907-2) then provides a constant battery feed to the ignition switch (C028-1) and the starter relay (C151-87). Both are connected by brown wires.

Fuel Supply

With the ignition switch in position "II" (C094-1), a feed is supplied to the fuel pump relay (C298-85) on a white wire. The relay is connected (C298-86) on a white/brown wire to the oil pressure switch (C187-1). When the engine is not turning over, there is no oil pressure. In this condition, the oil pressure switch is in the "closed" position. This provides an earth path and energises the fuel pump relay.

The ignition switch (C094-1) also provides a feed to pin 87A of the fuel pump relay (C298-87A) on a white wire. With the oil pressure switch in the "closed" position, the energised fuel pump relay is unable to provide a feed to the fuel pump (C115-2)