Did you review the charging system operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

Verify that the battery is undercharged or overcharged.

Is the battery properly charged?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Turn OFF all accessories. Connect the generator 4-way connector (if disconnected).
2. Start the engine and run at 2500 RPM.
3. Check the voltage across the battery terminals.

Is the voltage within the specified range?

13-16 V

Go to Step 4

Go to Step 6

Stop the engine. Perform the battery (parasitic) load test Refer to Battery Electrical Drain/Parasitic Load Test .

Is the parasitic load below the specified value?

22 ma

Go to Step 17

Go to Step 5

Determine the source of the excessive parasitic drain and repair as necessary.

Is the repair complete?

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Go to Step 17

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Was the voltage across the battery terminals with the engine running at 2500 RPM too low?

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Go to Step 7

Go to Step 10

1. Disconnect the generator 4-way connector. Turn the ignition switch to the RUN position.
2. Use a digital multimeter (DMM) to measure the CKT 225 voltage in cavity B of the generator connector.

Is the voltage above the specified value?

12 V

Go to Step 8

Go to Step 11

Check CKT 225 between the generator and the VCM for an Intermittent shorted/grounded condition or a poor connection Circuit Testing and Wiring Repairs in Wiring Systems.

Is CKT 225 OK?

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Go to Step 15

Go to Step 9

Repair CKT 225 as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is CKT 225 repair complete?

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Go to Step 16

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Check the Generator 4-way connector for a mis-wired condition in cavity D. This cavity should not be in this vehicle.

Has the mis-wired condition been repaired?

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Go to Step 16

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1. Disconnect or backprobe the CKT 225 connector at the VCM
2. Turn the ignition switch to the RUN position.
3. Use a DMM to check the voltage output of the VCM to CKT 225.

Is the voltage above the specified value?

12 V

Go to Step 12

Go to Step 13

Repair CKT 225 for a shorted, grounded, or open condition. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the CKT 225 repair complete?

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Go to Step 16

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Replace the VCM. Refer to VCM Replacement/Programming in Engine Controls. Is the repair complete?

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Go to Step 16

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Replace the generator. Refer to Generator Replacement . Is the repair complete?

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Go to Step 16

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1. Disconnect the negative battery cable.
2. Disconnect and clean all connections between the positive battery terminal and the generator output terminal. Check all cables for an intermittent open condition.
3. Disconnect and clean all connections in the ground circuit between the negative battery terminal and the generator housing. Check all cables for an intermittent open condition.
4. Connect the negative battery cable.

Is the repair complete?

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Go to Step 16

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1. Turn OFF all accessories. Connect the generator 4-way connector (if disconnected).
2. Start the engine and run at 2500 RPM.
3. Check the voltage across the battery terminals.

Is the voltage within the specified range?

13-16 V

Go to Step 17

Go to Step 6

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3