Section C - Electrics
Harness Data
Wire and Harness Number Identification
C - 21 C - 21
9803-9450-1
Wire Numbers and Functions
Wires 000-199
These numbers are reserved for ignition feeds, heater start
circuits and start circuits. These can be further categorised
by:
–Wires 000 - 099 are allocated to unfused ignition
feeds.
–Wires 100 - 199 are allocated to fused ignition feeds.
Note: Feeds via ignition relays are classed as ignition
feeds.
Wires 200-399
These numbers are reserved for battery feeds, They can
be further categorised by:
–Wires 200 - 299 are allocated to unfused battery
feeds.
–Wires 300 - 399 are allocated to fused battery feeds.
Wires 400-599
These numbers are reserved for instruments, i.e.
alternators to tachos, temperature switches to warning
lights, etc. and signal wires used in electronic systems.
Wires 600-799
These numbers are used for earth wires. When the
number is printed onto a wire 15-A it is prefixed by the
Earth symbol 15-B. This symbol is printed onto the wire, it
may however be omitted from harness drawings.
Fig 15.
Where a load is switched negative, the wire number from
the load to the switch shall be different to that of the wire
from the switch to the earth.
Wires 800-999
These numbers are reserved for switched supplies to
electrical loads, i.e. to lights, etc.
Wires In Splices
The main input wire is allocated with a wire number and a
suitable description, i.e. Wire 640 earth splice to earth. The
additional wires in the splice are allocated the same wire
number and a postfix, i.e. 640A, 640B, etc.
Note: The letters I, O, Q and S are not used.
General Points
1 Wires continue to have the same number even after
passing through a connector block to another
harness.
2 If all the numbers in a category have been allocated,
then the category is re-used with an additional prefix
'1', i.e. 1832.
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