WIRING GP-CHASSIS 3967835 - Caterpillar

Procedure
Turn the key start switch to the OFF position. Turn the disconnect switch to the OFF position. The Transmission/Chassis ECM is located behind the operator seat and on the right side of the cab. Disconnect the machine harness connectors J1 and J1 from the ECM.
Remove the ECM from the machine.
Make sure that the replacement ECM has the correct part number.
Install the replacement ECM.
Connect the machine harness to the ECM.
Turn the disconnect switch and the key start switch to the ON position. Make sure that the ECM successfully completes the start-up test.
Determine whether the replacement ECM is programmed. Connect the Cat Electronic Technician (ET) service tool to the service tool connector of the machine. If the ECM is NOT programmed, the service tool will indicate the problem. An ECM that is NOT programmed must be programmed before use. Use the Cat Electronic Technician (ET) service tool to flash the ECM.If the ECM is programmed, the service tool provides access to the expected areas of the ECM.Select the "Service" menu item with the service tool. Select the "Configuration" function. A list of items will appear. Select the proper items and program the correct information. This information is available from the old ECM or from your dealer.Perform calibration procedures. See Testing and Adjusting, "Calibration" for the calibrations that are required.