DESCRIPTION AND OPERATION CHARGING AND STARTING – KV6 (NORTH AMERICA) DESCRIPTION Starting The starting system on the vehicle comprises a 12 volt starter motor which drives the engine to start the combustion process. The starter converts electrical energy into mechanical power. The vehicle electrical system must be capable of supplying sufficient power to enable the engine to be cranked. Charging The charging system comprises a battery and an alternator. The battery must be of a sufficient capacity to operate the starter motor and operate various electrical systems in the vehicle. The alternator charges the battery when the engine is running and increases its output as demand on the battery increases. The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – Siemens (NAS) section of the System Description and Operation Workshop manual.
OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fuse 10, and the main relay (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also provides a feed to the starter motor solenoid (C0178) on an R wire. Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box. Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 6, fuse 8, and fuse 19 of the passenger compartment fuse box (C0588) on a G wire. When the ignition switch is turned to the 'crank' position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire. Starting Main Relay Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the Engine Control Module (ECM) (C0603) on a W wire. When the ECM receives this feed, it energises the main relay by providing an earth path for the relay coil (C0578) on an NG wire. The energised main relay is now able to provide a feed to the fuel pump relay. The fuel pump relay is also located in the engine compartment fuse box.
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