CIRCUIT BREAKER AS 4387859 - Caterpillar

Harness Wire Identification
Caterpillar identifies all wires with 11 solid colors. The circuit number is stamped on the wire at a 25 mm (1 inch) spacing. Table 1 lists the wire colors and the color codes.
Table 1
Color Codes for the Harness Wire
Color Code Color Color Code Color
BK Black BU Blue
BR Brown PU Purple
RD Red GY Gray
OR Orange WH White
YL Yellow PK Pink
GN Green For example, a wire identification of F730-OR(Orange) on the schematic would signify an orange wire with the circuit number F730. F730-OR(Orange) identifies the power supply for the oil pressure sensor.Note: Always replace a harness wire with the same gauge of wire and with the same color code.Note: In the following diagrams, "Pxxx" signifies a plug and "Jxxx" signifies a jack.Schematic Diagrams
Illustration 1 g02791046
Schematic Diagram for the Engine Harness
Illustration 2 g02791016
Schematic diagram for the application harness