ENGINE AR 7E0781 - Caterpillar

The setpoint for the system voltage (P07) specifies the battery voltage.24 - 24 Volt System32 - 32 Volt SystemNote: The GSC does not receive battery power when the ECS is in the OFF/RESET position. When contact 6 is connected to one of the contacts (8, 9, 10), the GSC receives battery power when the ECS is in the OFF/RESET position. Before beginning this procedure, ensure that the following steps have been performed:
VERIFY THE DIAGNOSTIC CODE.
Make sure that the CID 168 FMI 03 is shown on the display.
Enter service mode.
Turn the ECS to the STOP position.
Program setpoint P023 to 0. This programs the GSC for an MUI engine. This eliminates the engine control module (ECM) as a possibility of the fault. For more information, see System Operation, Protective Relaying Programming OP5.
Turn the ECS to the OFF/RESET position. Disconnect the jumper wire on the ECS that is between pin 6 and pin 9. Not all generators will have a jumper wire between pin 6 and pin 9. Proceed to Step 1.Test Step 1. CHECK THE SYSTEM'S VOLTAGE.
Turn the ECS to the STOP position.
Measure the voltage across the battery terminals.Expected Result:For a 24 volt system, the voltage should be between 24.8 DCV and 29.5 DCV. For a 32 volt system, the voltage should be between 33.1 DCV and 39.3 DCV.Results:
OK - For a 24 volt system, the voltage is 24.8 DCV to 29.5 DCV. For a 32 volt system, the voltage is 33.1 DCV to 39.3 DCV. Proceed to Test Step 2.
NOT OK - For 24 volt systems, the voltage is not between 24.8 DCV to 29.5 DCV. For a 32 volt system, the voltage is not between 33.1 DCV to 39.3 DCV. The problem is in the charging system.Repair: Proceed to Testing and Adjusting, "Charging System - Test". Stop.Test Step 2. COMPARE THE VOLTAGE BETWEEN "TS1-1" AND THE BATTERY VOLTAGE.
Turn the ECS to the STOP position.
Measure the battery voltage across the terminals. Take note of the battery voltage.
Measure the voltage between "TS1-1" and "TS1-30". Take note of the voltage.
Compare the battery voltage that was measured with the voltage measured between "TS1-1" and "TS1-30".Expected Result:The voltage measured at the battery and the voltage measured between "TS1-1", "TS1-30" should be within 2.0 DCV. of each other.Results:
OK - The voltage measured at the battery and the voltage measured between the terminals are within 2.0 DCV of each other. Proceed to Test Step 3.
NOT OK - The voltage measured at the battery and the voltage measured between the terminals are NOT within 2.0 DCV of each other. The wiring harness is not correct.Repair: Repair the wiring harness or replace the wiring harness. Proceed to Test Step 7.Test Step 3. COMPARE THE VOLTAGE BETWEEN "TS1-1" AND THE ECS.
Turn the ECS to the STOP position.
Measure the voltage between "TS1-1" and "TS1-30". Take note of the voltage.
Measure the voltage at terminal "6" on the ECS. Take note of the voltage.
Compare the measured voltages.Expected Result:The voltage that was measured at the terminals and the voltage that was measured