120H, 12H, 135H, 140H, 143H, 160H and 163H Motor Graders Caterpillar

General Information

The service tool connector for the machine is located to the right of the operator's seat.

The Electrical System Schematic, Parts Manual and Operation and Maintenance Manual for the machine that is being serviced should be used to locate electrical components and connectors.

The following information is a guide to reading the tables on the back of the Electrical System Schematic.

• The "Component Location" table uses white circles to mark the locations in the profile of the machine and in the area views. Alphabetical letters in the "Machine Location" column indicate a general area of the machine. Refer to the corresponding footnote at the end of the table for a description of the location.

• The "Harness Connector Location" table uses white circles to mark the locations in the general view and in the area views. Alphabetical letters in the "Machine Location" column indicate a general area of the machine. Refer to the corresponding footnote at the end of the table for a description of the location.

Connector Contact Numbers

Illustration 1	g00762558
Power Train ECM (1) Connector J1 (2) Connector J2

Illustration 2	g00762580
Power Train ECM (3) Screw

Illustration 3	g00762584
The Wire Side Of The ECM Connector

To remove the machine harness from the ECM, use screw (3) in the center of the harness connector.