Starting - operation

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 generator charges at its maximum rate until 14 volts is generated. As battery voltage rises, the generator current output voltage reduces.

STARTING - OPERATION

With the ignition switch in position ’II’, current flows to fuse 20 (C581-13) of the passenger compartment fuse box on a white wire. Fuse 20 (C581-20) is connected to the fuel pump relay coil (C157-2) in the engine management relay module by a white/green wire. The fuel pump relay coil (C157-1) is earthed through the ECM (C634-24) on a blue/purple wire.

The ECM earths the fuel pump relay for a short period of time when the ignition switch is in position ’II’, and continuously during cranking and while the engine is running.

With the fuel pump relay energised, current from fuse 6 (C574-2) of the engine compartment fuse box can flow across the relay (C154-7 & C154-4) to the inertia switch (C123-3) on a white/purple wire. Assuming the inertia switch is closed, current flows across the switch (C123-1) to the fuel pump (C113-4) on a white/purple wire. The fuel pump is earthed (C113-3) on a black wire.

When the ignition switch is turned to the ’crank’ position, current flows across the switch (C94-1) to the starter relay coil (C151-85) on a white/red wire. The relay coil (C151-86) is connected in series to the inhibitor switch (C69-5) by a black/yellow wire. Assuming the gear selector lever is in the ’Park’ or ’Neutral’ position, a route to earth is provided from the inhibitor switch (C69-4) to the Alarm ECU (C57-10) on a black/orange wire.