• When adding wiring in the cab, always secure it with existing lights.
If necessary, and additional lights. Avoid routing wiring on the cab
floor.
(2) Connection
Changes to existing wiring should be avoided to the extent possible.
Alteration may cause short circuits, breaks in connections or overheating,
presenting serious risk of personal injury and property damage. Additions
or modifications to existing circuitry, when necessary, should not be un-
dertaken without a thorough electrical system analysis.
When splicing is necessary, it must conform to the following:
• Strip insulation from wire ends avoiding damage to the wires. Caulk
both ends of the wires with fittings. Assure mechanical joint strength.
Solder the connection.
• Properly insulate the connection.
• Avoid splices or connections where water may collect.
• Do not make connections in areas of movable parts or where wires
must be bent at sharp angles.
(3) Circuit Protection
• Do not replace an original factory fuse with a higher rated fuse.
• Do not add to or modify an existing circuit such that the total circuit cur-
rent draw exceeds the rating of the fuse provided for the circuit.
• When adding to an existing circuit, use wire of the same gauge of the
existing circuit.
• When adding a circuit, protect the circuit with the original fuse or pro-
vide an appropriate fuse, fusible link or circuit breaker. Install the pro-
tector as close to the power source as possible.
(4) Wire Size
• Use automotive low-tension wire (JIS C3406,SAE J1128 Low Tension
Primary Cable) for added circuits.
• Wire size should be determined by a thorough analysis of the load cur-
rent and circuit protection. Refer to Table I for wire sizes and permis-
sible current:
TABLE I
Permissible amperage of automotive low-tension wires when conduc-
tor’s maximum permissible temperature is 176°F (80°C) and ambient
temperature is 140°F (60°C).
Size AWG Permissible Electric
mm
2
Current (A)
0.5 19 9
0.85 17 11
1.25 16 14
2 14 20
3 12 27
5 10 36
8 8 47
20 4 86
30 2 120
100 4/0 232
C20
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