KIT-CONNECTING PLUG 3314226 - Caterpillar

Harness Wire Identification
Caterpillar identifies all wires with eleven 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 on the schematic would signify an orange wire with the circuit number F730. F730-OR 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 g01780895
Schematic Diagram for the C4.4 Engine Harness
Illustration 2 g01782875
Schematic Diagram for the C6.6 Engine Harness
Illustration 3 g01817179
Schematic Diagram for a Typical ApplicationNote: The functionality of most of the connections to the J1 connector depend on the engine application.