EQUALIZER BAR GP 3P8763 - Caterpillar

Illustration 1 g01199226
Typical example
Illustration 2 g01218324
P1 ECM connector
(P1-52) +Battery
(P1-53) +Battery
(P1-63) −Battery
(P1-65) −Battery
(P1-70) Keyswitch
Illustration 3 g01234146
Location of ECM connectors
Note: If a remote START switch is installed, the remote START switch must be in the STOP position for this test. Test Step 1. Inspect Electrical Connectors and Wiring
Turn the ECS to the OFF/RESET position.
Turn the circuit breaker for the battery to the OFF position.
Verify that the circuit breakers are not tripped.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Inspecting Electrical Connectors" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring need repair.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check the Voltage to the ECM
Disconnect the ECM connector J1/P1.
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the STOP position. Note: Verify that wire D229 and wire 229 have continuity from the ECM to the −Battery terminal.
Measure the voltage at the ECM. Measure the voltage between P1-53 and P1-65. Measure the voltage between P1-52 and P1-63.
Measure the voltage between P1-70 and P1-65 at the ECM. Expected Result:The voltage is 24 3 VDC. The difference between the three voltage measurements is less than 0.5 VDC.Results:
OK - The ECM is receiving the correct voltage.Repair: The problem may be intermittent. If the problem is intermittent, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
OK - The voltage is more than 24 3 VDC.Repair: There is a problem with the alternator. Refer to Specifications, "Alternator and Regulator" for information on the charging system.STOP
Not OK - The voltage is less than 24 3 VDC. The wiring or components between the battery and the ECM may be preventing the voltage from reaching the ECM. Proceed to Test Step 3.
Not OK - P1-70 - The voltage is less than 24 3 VDC on the input for the keyswitch to the ECM. Proceed to Test Step 6.Test Step 3. Check the Battery Voltage
Turn the circuit breaker for the battery to the OFF position.
Turn the ECS to the OFF/RESET position.
Measure no-load battery voltage at the battery terminals. Refer to Testing and Adjusting, "Test Tools for the Electrical System" for the proper procedures to check the batteries.
Load test the batteries. Use the 4C-4911 Battery Load Tester. Refer to the Operating Manual, SEHS9249. Refer to Special Instruction, SEHS7633. Expected Result:The no-load voltage at the batteries is at least 23.5 VDC and the batteries pass the