CYLINDER 5M7306 - Caterpillar

The Electrical System Schematic, Parts Manual and Operation and Maintenance Manual for the vehicle 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 vehicle and in the area views. Alphabetical letters in the "Machine Location" column indicate a general area of the vehicle. 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 vehicle. Refer to the corresponding footnote at the end of the table for a description of the location.Connector Contact Numbers
Illustration 1 g01255959
Electronic Control Unit (ECU)
Illustration 2 g01255962
ECU Harness Connectors J1 and J2 that mate to the ECU.
70 Terminal OEM Connector
The 70-pin Deutsch connector is used to route power and certain dedicated switch inputs to the ECU. Crimping and wire specifications for this connector are similar to the 70 terminal connector. The figures below show pin and socket locations and keying for the 70-pin connector.
Illustration 3 g01260645
70-pin OEM Plug Connector
Service Tool Connector
Illustration 4 g01920626
9-pin Connector
(A) + Battery
(B) - Battery
(C) J1939 Data Link Shield
(D) Cat Data Link +
(E) Cat Data Link -
(F) J1939 Data Link Low
(G) J1939 Data Link High
(H) J1587 Data Link -
(J) J1587 Data Link +