Ignition

When the ignition switch is turned to the "crank" position (090-1), it provides a feed to the starter relay coil (C151-85) on a white/red wire. The relay is earthed (C151-86) on a black wire. Feed from fusible link 2 (C907-2) of the engine compartment fuse box can now flow across the starter relay (C151-87 & C151-30). Current flows from the starter relay (C151-30) to the similarily energised fuel pump relay (C298-87) on a white/red wire. The fuel pump relay (C2298-30) then provides a feed to the fuel pump (C115-2) on a white/purple wire. The fuel pump is earthed (C115-3) on a black wire.

With the engine running, and the ignition switch turned back to position "II" (C094-1), the oil pressure switch will sense oil pressure. This opens the switch and de-energises the fuel pump relay. Feed to the fuel pump is now provided solely by the fuel pump relay.

Ignition

With the ignition switch in position "II", a feed is supplied to the ignition coil (C156-1) and the ignition amplifier module (C633-3). Both are supplied current on white wires and are connected in parallel. An earth path is provided by the ignition amplifier module fixings.

When the ignition switch is turned to the "crank" position, power flows across the switch (C090-1) to the starter relay (C151-85) on a white/red wire. The relay is earthed (C151-86) on a black wire. This flow of current energizes the relay coil and allows a battery feed to flow across the relay (C151-87 & C151-30) and onto the starter motor (C179-1) on a white/red wire. This feed energizes the starter solenoid, and allows a feed from the alternator (C178-1) on a brown wire to operate the starter motor. An earth is provided by the starter motor.