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6 Power and Ground Wiring
Correct wiring of the power supplies is a very important part of the installation process. The
following sections describe wiring of power supplies to the ECU and also power supplies
from the ECU.
6.1 Power Supplies
The following diagram shows the recommended wiring arrangement for the power supplies.
The following key points are worthy of noting:
· The switch labelled ‘ignition switch’ is usually the key. The wire that is used to turn on
the main relay should be energised when the key is in the ‘ON’ position. Do not use a
source that provides power when the key is in the ACC position as these are typically
disconnected while the starter motor is being cranked.
· Each relay uses it’s own fuse. Ideally these should be located as close to the battery
as possible to minimise the length of unfused wiring.
· When the main relay is turned off all other relays will turn off. However, the high
current supplied by the other relays is NOT drawn through the main relay.
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