307C Excavator Electrical and Electronic System Caterpillar

To determine the location of the electrical components, connectors and harnesses, see the Electrical System Schematic, RENR4044. The views are general views and area views. The area views include the following items:

• "Area A:" Inside of the cab

• "Area B:" Inside of the right console

• "Area C:" Inside of the left console

• "Area D:" Under surface of platform

• "Area E:" Around the relay panel

• "Area F:" Inside the box of fuses and relays

• "Area G:" Around the control valve

The following information is a guideline to reading: the tables for connectors, the tables for component locations, the area views and the machine profile. All of these components can be found on the back of the Electrical System Schematic.

• The component location table uses white circles as location labels. The white circles are used in the machine profile and area views. See the corresponding footnote at the end of the table for a description of the location.

• The connector location table uses white circles as location labels in the general views and area views.

Harness And Wire Identification

The color of the wire and size of the wire are shown in the Electrical Circuit Diagram and in the following table:

Table 1

Symbol	Color
BK	Black
BU	Blue
BR	Brown
GY	Gray
GN	Green
OR	Orange
PK	Pink
PU	Purple
RD	Red
WH	White
YL	Yellow

For example, a table might contain 308-BK-18.

"308" is the circuit identification code. "BK" is the wire color. "18" is the wire size. The wires are listed by American Wire Gauge (AWG) sizes. The default wire size is No. 16.

Illustration 1	g00760542
Typical Example Of a Partial Electrical Schematic (1) Harness A (2) Harness C

Note: Harnesses in the partial electrical schematics are located in the "Testing and Adjusting Section" of this publication. Harnesses are identified by the codes "A", "B" or "C". These harnesses are also indicated in the general views and area views on the Electrical System Schematic, RENR4044.