Adlard Coles Book of Diesel Engines by Melanie Bartlett;

Author:Melanie Bartlett;
Language: eng
Format: epub
ISBN: 9781472955418
Publisher: Bloomsbury UK
Published: 2018-02-15T00:00:00+00:00

Fig 17 Basic electrical circuit.

Tracing an engine’s wiring loom can be complicated because some wires do two or more jobs, and it is not possible to see exactly what is going on inside some components.

Here, the battery supplies power to the starter solenoid, which – when activated – passes it on to the starter. The starter returns the current to the battery through the engine block itself, shown by the ‘earth’ symbol.

The solenoid is activated by the key switch, which draws power from the battery through a thinner wire and feeds it to the solenoid. The solenoid current returns to the battery through the starter’s earth connection.

The alternator creates current that flows straight to the battery and is returned through the engine block. A thinner wire links the alternator terminal labelled ‘IND’ to the warning light, which is connected to the battery through the key switch. So long as the alternator is charging, no current flows through this wire, but if the alternator fails, current flows from the battery, through the switch and warning light, and returns to the earth.

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