John Deere 003353.09 – CCU: Alternator Not Charging CCU

The system has detected a fault related to the alternator, specifically that it is not charging the rear chassis. This issue may affect the power supply to the rear chassis components. The .09 Failure Mode Identifier (FMI) indicates a communication error, such as a missing CAN bus message, implying that the Chassis Control Unit (CCU) is not receiving the expected signals from the alternator or a related control unit.

• 6090M
• 6095 MC
• 6095 RC
• 6100M
• 6105 MC
• 6105 RC
• 6105J
• 6105M
• 6105R
• 6110M
• 6110MC
• 6110RC
• 6115M
• 6115 MC
• 6115 RC
• 6115R
• 6120M
• 6125M
• 6125R
• 6130M
• 6130R
• 6135M
• 6140J
• 6140JH
• 6140M
• 6140R
• 6145M
• 6150M
• 6150R
• 6150RH
• 6155J
• 6155JH
• 6155M
• 6155MH
• 6170M
• 6170R
• 6175M
• 6190R
• 6195M
• 6210M
• 6210R
• 6M 95
• 6M 105
• 6M 110
• 6M 115
• 6M 120
• 6M 125
• 6M 130
• 6M 140
• 6M 145
• 6M 150
• 6M 155
• 6M 165
• 6M 175
• 6M 180
• 6M 185
• 6M 195
• 6M 200
• 6M 210
• 6M 220
• 6M 230
• 6M 240
• 6M 250
• 6M-1654
• 6M-1854
• 6M-2104
• 6MH 155

1. 1

   Perform a visual inspection of the charging system for any signs of damage, debris accumulation, or corrosion around the batteries and alternator, and check for loose or damaged wires and terminals.

2. 2

   Check the battery state of charge with the engine off using a multimeter (a fully charged 12-volt battery should read approximately 12.6 volts).

3. 3

   Inspect the alternator belt for proper tension and for any signs of wear, such as cracks or fraying, which can cause slipping.

4. 4

   Perform an engine running voltage test by starting the engine, letting it run at a moderate RPM (around 1500 RPM), and measuring the voltage across the battery terminals (should read between 13.5 and 14.5 volts).

5. 5

   Test the alternator output directly with the engine running by connecting the positive lead of a multimeter to the alternator's output terminal (BAT or B+) and the negative lead to a good frame ground (should read between 13.5 and 14.5 volts).

6. 6

   Inspect the wiring harness leading to the alternator for any frayed wires, cracked insulation, or loose connectors, paying close attention to connections at the alternator itself and checking battery cables for corrosion and tightness.

7. 7

   Inspect the fuses and fusible links within the charging circuit to ensure no blown components are interrupting current flow.

1. 1

   Safety First

   Disconnect the negative battery cable to prevent accidental short circuits.

2. 2

   Access the Alternator

   Depending on the specific tractor model, remove panels or other components to gain access to the alternator.

3. 3

   Loosen the Belt

   Loosen the tension on the serpentine belt and remove it from the alternator pulley.

4. 4

   Disconnect Electrical Connections

   Carefully disconnect the wiring harness and the main output wire from the back of the alternator.

5. 5

   Remove the Alternator

   Unbolt the alternator from its mounting brackets and remove it from the engine.

6. 6

   Install the New Alternator

   Mount the new alternator and tighten the mounting bolts to the manufacturer's specified torque.

7. 7

   Reconnect Electrical Connections

   Attach the wiring harness and the main output wire to the new alternator.

8. 8

   Reinstall the Belt

   Route the serpentine belt correctly and apply the proper tension.

9. 9

   Reconnect Battery

   Reconnect the negative battery cable.

10. 10

    Test the System

    Start the engine and perform the Engine Running Voltage Test and Alternator Output Test to confirm the new alternator is charging correctly.