BOX GP-BATTERY 3052543 - Caterpillar

The wiring schematics are revised periodically. The revisions reflect the updates to the engine's wiring harness. For the most current information, always check the revision number of the schematic. Use the schematic with the latest revision number.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     GN     Green    
BR     Brown     BU     Blue    
RD     Red     PU     Purple    
OR     Orange     GY     Gray    
YL     Yellow     WH     White    
        PK     Pink    For example, a wire identification of A701-GY on the schematic would signify a gray wire with the circuit number A701. A701-GY identifies the power circuit for the No. 1 Injector solenoid.Another wire identification on the schematic is the size of the wire. The size of the wire will follow the wire color. Wire size or gauge is referred to as AWG (Americal Wire Gauge). AWG is a description of the diameter of the wire.For example, a code of 150-OR-14 on the schematic would indicate that the orange wire in circuit 150 is a 14 AWG wire.Requirements for Wire Size
The wire size to all Caterpillar components must have an adequate size in order to handle the maximum current of the circuit. Table 2 shows the various AWG wire numbers that are used. The metric equivalents for the diameter of the AWG wire numbers are also shown.
Table 2
Metric Equivalents for AWG Wire Numbers    
AWG Wire Number     Diameter (mm)     AWG Wire Number     Diameter (mm)    
20     0.8     14     1.6    
18     1.0     12     2.0    
16     1.3     4     3.2    Follow these requirements for wire size:
Make all positive battery connections and all negative battery connections to the customer connector with 14 AWG wire.
Make all negative battery connections from the bridge displays to the negative bus bar with 12 AWG wire minimum.
Make all other connections with 16 AWG wire minimum.
Connect only the recommended components to the negative battery wiring for the bridge displays.Wiring for the Cat Data Link
Make all connections for the Cat Data Link with 143-5018 Wire .Battery Connections
Caterpillar recommends bus bars which are dedicated solely to the electronic devices that are connected to the engine Electronic Control Module (ECM). This ensures that the ECM, the switches, the sensors, and the electronic display modules have a common reference point.Make the battery connections according to Illustration 1. This ensures that all of the components in the system have the negative battery bus bar as a common reference point.
Illustration 1 g01126072
Battery connections for the operator station (two engine arrangement)All negative battery connections must begin at the negative battery bus bar