ALTERNATOR GP-CHARGING 7C1905 - Caterpillar

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Check if there is the jumper between terminals 4 and 7.Expected Result:There is a jumper that is placed between terminals 4 and 7.Results:
YES - If a remote voltage adjust potentiometer is NOT used, the jumper is properly installed. Proceed to test step 6.
YES - If a remote voltage adjust potentiometer is used, the jumper should be removed from terminals 4 and 7. In this case, the remote voltage adjust potentiometer should be connected to terminals 6A and 7. Proceed to test step 5.
NO - There is no jumper between terminals 4 and 7. The regulator may go into the overexcitation shutoff.Repair: Verify the wiring schematics. Install the jumper in accordance with the wiring schematic.STOPTest Step 5. CHECK THE RESISTANCE OF THE REMOTE VOLTAGE ADJUST POTENTIOMETER
Disconnect, float, and isolate the connecting wires from the VR6 voltage regulator terminals 6A and 7.
Measure the resistance of the remote voltage adjust circuit. Measure the resistance at the wire ends. Expected Result:The resistance should be between 0 K Ohm and 10 0.5 K Ohm.Results:
YES - The resistance increases smoothly within the specified range. Proceed to test step 6.
NO - The resistance is not within the specified value of above zero ohms to 10K ohms. The resistance jumps to a high value when the potentiometer is adjusted or reads zero or infinity ohms.Repair: If the value is erratic, replace the remote voltage adjust potentiometer. Inspect all of the wiring and wiring terminations, including the solder joints that are at the remote voltage adjust potentiometer terminals. Look for wires that may have become pinched or that have damaged wire insulation. Pinched or damaged wire insulation may create an open or short circuit. Replace the wiring and reheat any solder joints as necessary. Use care to avoid excessive heat exposure to the potentiometer terminals when soldering the connecting wires to the potentiometer.STOPTest Step 6. CHECK THE SENSING CONNECTIONS
Check if there is a jumper between terminals 6A and 9.Note: If you are using three-phase sensing, terminals 6A and 9 should be jumpered. If you are using single-phase sensing, this jumper should be removed.Expected Result:The jumper may be installed or the jumper may not be installed, based on the phase sensing selection.Results:
YES - The jumper is installed between terminals 6A and 9 for three-phase sensing. For single-phase sensing, the jumper is not installed between terminals 6A and 9. Proceed to test step 7.
NO - The jumper is not installed between terminals 6A and 9 for three-phase sensing. The jumper is installed between terminals 6A and 9 for single-phase sensing.Repair: Connect the jumper in accordance with the phase sensing selection.STOPTest Step 7. CHECK CONNECTIONS FOR THE DROOP CURRENT TRANSFORMER (CT)
The genset remains off.
For a 1 A CT, verify that the connections are to terminals 5 and 6.
For a 5 A CT, verify that the connections are to terminals 5A and 6.Note: For troubleshooting purposes, the voltage regulator can be operated when the droop CT is disconnected. However, the droop CT secondary wires must be connected together.
Verify that