7 - 1
Wire/Harness Numbers - Explanation of:
Each wire has its own unique number which is printed on the wire insulation every 50mm (2 inches). The wire numbers listed on
the following pages identify the source, route and final destination of all the wires used on the machine.
Also printed on the wire insulation is the part number of the harness from which the wire originates; the harness part number is
shortened,e.g., if the harness part number is 719/37100, the number printed on the harness wire insulation will be 9/371 (71 and
00 are common numbers and, therefore, are deleted).
The illustration shows a typical connector and wires. To summarise, the number printed on the wire insulation in the example
shown identifies the following:
819 = The wire's unique identification number.
9/371 = The part number of the harness from which the wire originates.
Finally, some more points to note regarding wire identification:
1 Wires will continue to have the same number, even after passing through a bulkhead connector into a different harness.
2 The wire number categories shown in the tables on the following pages are as follows:
2.1 Wire numbers 000 to 199. Wires in this number bracket are allocated to live feeds when the starter switch is at the
IGN position, heater start circuits and start circuits.
2.2 Wire numbers 200 to 399. Wires in this number bracket are allocated to battery feeds.
2.3 Wire numbers 400 to 599. Wires in this number bracket are allocated to instruments (alternator to tacho, fuel gauge
senders to fuel gauges etc).
2.4 Wire numbers 600 to 799. Wires in this number bracket are allocated to earth paths.
2.5 Wire numbers 800 to 999. Wires in this number bracket are allocated to switched supplies to lights, horn etc from
switches and relays.
3 When a wire terminates in a splice and a branch of wires comes from that splice, all wires will have their own unique
identification number.
Section C
Electrics
9803/8500
Section C
7 - 1
Issue 1
Wire Number Identification
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