CASE (L.H.) 3K3776 - Caterpillar

Illustration 1 g01222760
View of left hand side of the cab (1) Machine service connector (2) Power Train ECM with J1 and J2 connectors (Electrical disconnect switch) The Power Train ECM is located on the left side of the cab under the left console. The machine service connector for ET connection is located on the rear left side of the cab behind the operator seat.When a procedure requires that the machine electrical system should be turned OFF, move the key switch to the OFF position and move the electrical disconnect switch (3) to the OFF position.In order to locate machine wiring harness connectors on the machine, the Electrical System Schematic, Parts Manual and Operation and Maintenance Manual for the machine that is being serviced should be used.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 or light gray circles in order 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 or light gray circles in order 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 2 g00554751
Electronic Control Module (ECM)
Illustration 3 g01090860
Machine Harness Connectors J1 and J2 that mate to the ECM.