ENGINE AR-PRIMARY 4605760 - 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 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
C4.4 Engine
Illustration 1 g02101233
Schematic diagram of the C4.4 engine connections to the J2 connector on the ECMC6.6 Engine
Illustration 2 g02668296
Schematic diagram of the C6.6 engine connections to the J2 connector on the ECMNOx Reduction System (NRS)
Illustration 3 g02101473
Schematic diagram of the C4.4 and C6.6 NRS equipmentClean Emissions Module (CEM)
Illustration 4 g02554116
Schematic diagram of the Clean Emissions Module (CEM)Wiring for the Application
Illustration 5 g02476567
Schematic Diagram for a Typical Application