Charging Alternator

The energised starter relay (C0151) provides a feed to the immobilisation ECU (C0059) on an NR then B wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter motor solenoid (C0179) on a B wire, and the glow plug ECU (C0190) on a B then NR wire. When the glow plug ECU receives the feed from the immobilisation ECU, it immediately cuts the feed to the glow plugs and the glow plug warning lamp.

The feed supplied by the immobilisation ECU energises the starter motor solenoid. The energised starter motor solenoid allows a battery feed to power the starter motor on an R wire.

Charging Alternator

The battery (C0192) provides a permanent feed to the alternator (C0183) via the starter motor (C0178) on an R then N wire.

When the engine is started, the magnetised rotor within the stator windings generate 3 phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field diodes in the rectifier pack convert the ac current into direct current (dc). Output current from the field diodes supplements the initial current flowing through the field windings. This causes an increase in the magnetic influence of the rotor, resulting in self-exitation of the alternator. The field current increases with rotor speed and thus increases the generated current and voltage until the alternator is fully excited. The alternator (C0183) charges the battery (C0192) by providing current on an N then R wire.

Ignition/No Charge Warning Lamp

Fuse 15 of the passenger compartment fuse box (C0580) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a WG wire. The earth path for the warning lamp (C0233) is controlled by the alternator (C0185) on an NY wire. 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.