ALTERNATOR GP-CHARGING 1906566 - Caterpillar

must be in the COOL/STOP position.
Measure the voltage at the Primary ECM and the Secondary ECM. Measure the voltage between P1-6 and P1-5. Measure the voltage between P1-4 and P1-11. Measure the voltage between P1-23 and P1-11.Expected Result:The voltage should be 24 3 VDC.The difference between the three voltage measurements should be less than 0.5 VDC.Results:
OK - The ECM is receiving the correct voltage. Proceed to test step 8.
Not OK - The voltage is incorrect. The wiring or components between the battery and the ECM may be preventing the voltage from reaching the ECM. Proceed to test step 3.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.
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 should be at least 23.5 VDC and the batteries should pass the load test.Results:
OK - The battery voltage is okay and the battery passes the load test. Proceed to test step 4.
Not OK - The battery voltage is incorrect and/or the battery fails the load test.Repair: The batteries or the alternator are causing the problem. Recharge the batteries or replace the batteries. Check the operation of the alternator. Verify that the original condition is resolved. Stop.Test Step 4. Check the Voltage at the Emergency Stop Relay.
Reconnect the Primary ECM connector and the Secondary ECM connector J1/P1.
Turn the circuit breaker for the battery to the ON position.
Turn the ECS to the STOP position.Note: If a remote START/STOP switch is installed the remote START/STOP switch must be in the COOL/STOP position.
Measure the voltage from wire 103-RD on terminal 30 of the emergency stop