The lights are operated from the lighting switch located on the steering column. The lighting switch has two positions. Position 1 switches on the tail lamps, the number plate lamps, and front side lamps. Position 2 additionally switches on the front headlamps. When the headlamps are on, the column switch can be used to switch between main beam and dipped beam.
The headlamps can be flashed with the lights on or off, by pulling the column switch towards the driver.
Operation
Feed from the positive battery terminal is connected to the engine compartment fuse box (C632-1) by a brown wire. Current passes through fusible link 1 and fusible link 2, which are connected in parallel. Power from fusible link 1 (C907-1) feeds the lighting switch (C041-1) on a brown wire.
Side Lamps
With the lighting switch in the side lamps position, power flows through the light switch (C041-2) to fuse 16 (C580-31) and fuse 15 (C580-29) of the passenger compartment fuse box on red wires. Fuses 16 and 15 are connected in parallel, fuse 16 feeding the RH lamps, fuse 15 the LH lamps.
Fuse 16 of the passenger compartment fuse box (C580-32) is connected to the RH front side lamp (C537-2) by a red/orange wire. The lamp is then earthed (C537-1) on a black wire. Fuse 16 also feeds the RH trailer pick-up (C418-1) on a red/orange wire. This is connected in series with the RH tail lamp (C401-3). The tail lamp is earthed (C401-1) on a black wire. Also connected in parallel with the RH front side lamp is the side lamp instrument pack warning lamp (C233-5), which is fed by a red/orange wire. The warning lamp is earthed (C233-2) by a black wire.
Fuse 15 of the passenger compartment fuse box (C580-30) is connected to the LH front side lamp (C538-2) by a red/black wire. The lamp is then earthed (C538-1) on a black wire. Connected in parallel with the LH front side lamp is the LH trailer pick-up (C877-1), which is also fed by a red/black wire. The trailer pick-up (C877-2) is connected in series to the LH tail lamp (C404-3) by a red/black wire. The tail lamp is earthed (C404-1) on a black wire.
Headlamps
With the lighting switch in the main beam position, power flows through the switch (C041-4) to the headlamp relay (C282-87) on a blue wire. The relay coil (C282-85) is energized when the ignition switch is in position "II", and is earthed (C282-86) on a black wire.
Dipped beam
When the relay coil is energized, it allows current to flow across the relay (C282-30) to the column switch (C036-1) on a blue wire. The column switch (C036-6) is connected to the dim dip relay (C048-8) by a blue/red wire. As the dim dip relay is not energized, current is allowed to flow from the relay (C048-2) to fuses 11 and 12 of the passenger compartment fuse box. Both fuses are fed by blue/red wires, and are connected in parallel. Fuse 11 feeds the RH headlamp, fuse 12 the LH headlamp.
Fuse 11 of the passenger compartment fuse box (C580-22) is connected to the RH headlamp (C011-2) by a blue/black wire. This illuminates the headlamp dipped beam and is earthed (C011-3) on a black wire.
Fuse 12 of the passenger compartment fuse box (C580-24) is connected to the LH headlamp (C009-2) by a blue/black wire. This illuminates the headlamp dipped beam and is earthed (C009-3) on a black wire.
Full Beam
When the column switch is moved to the main beam position (C036-5), current is supplied to fuse 13 (C580-25) and fuse 14 (C580-27) of the passenger compartment fuse box. Both are connected by blue/white wires. A feed is also supplied to the main beam warning lamp (C233-5) on a blue/white wire.
Fuse 13 (C580-26) supplies a feed to the RH headlamp (C011-1) on a blue/orange wire. The headlamp is earthed (C011-3) on a black wire.
Similarily, fuse 14 (C580-28) supplies a feed to the LH headlamp (C009-1) on a blue/slate wire. The headlamp is earthed (C009-3) on a black wire.
Headlamp Flash
Fusible link 2 (C907-2) of the engine compartment fuse box supplies a constant battery feed to fuse 2 (C580-3) of the passenger compartment fuse box. Fuse 2 (C580-4) is connected to the column switch (C036-7) by a purple wire.
When the column switch is pulled back to the flash position, current flows across the switch (C036-5) and provides a feed to fuse 13 (C580-25), fuse 14 (C580-27) and the instrument pack warning lamp (C233-5) on blue/white wires. All 3 are earthed on black wires as described in the 'Full Beam' description.