Did you perform the Diagnostic System Check for starting and charging?

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Go to Step 2

Go to Diagnostic System Check - Engine Electrical

Important:: The green POWER lamp of the tester should remain illuminated while the tester is being used.

1. Connect the red lead of theJ 41450-B CS Generator Electronic Tester to the generator output terminal.
2. Connect the black lead of theJ 41450-B CS Generator Electronic Tester to the generator housing.

Does the green POWER lamp on the tester light?

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Go to Step 4

Go to Step 3

Measure the voltage from the output terminal of the generator to a good ground.

Does the voltage measure greater than the specified value?

12 V

Go to Step 11

Go to Step 10

Caution: Make sure that the load is completely turned off before connecting or disconnecting a carbon pile load tester to the battery. Otherwise, sparking could ignite battery gasses which are extremely flammable and may explode violently.

1. Disconnect the generator harness connector.
2. Locate the matching harness connector on the J 41450-B and connect it to the generator.
3. Connect a carbon pile tester to the vehicle.
4. Connect an inductive ammeter to the output circuit of the generator.
5. Start the engine and allow it to idle for two minutes.

Does the red DIAGNOSTIC lamp on the tester light?

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Go to Step 12

Go to Step 5

Increase the engine speed to 2500 RPM.

Does the red DIAGNOSTIC lamp on the tester light?

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Go to Step 12

Go to Step 6

1. Maintain the engine speed at 2500 RPM.
2. Turn on the load of the carbon pile tester and increase the load until the generator output is greater than or equal to the load test value given in Generator Usage .

Is the generator output greater than or equal to the load test value given in Generator Usage in this section?

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Go to Step 7

Go to Step 12

Maintain the engine speed at 2500 RPM and continue to operate the generator at the load test value.

Does the red DIAGNOSTIC lamp on the tester light?

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Go to Step 12

Go to Step 8

1. Maintain the engine speed at 2500 RPM and continue to operate the generator at the load test value.
2. Measure the voltage drop from the output terminal of the generator to the positive terminal on the battery. Refer to Circuit Testing and Connector Repairs in wiring repairs.

Does the voltage measure greater than the specified value?

0.5 V

Go to Step 10

Go to Step 9

1. Maintain the engine speed at 2500 RPM and continue to operate the generator at the load test value.
2. Measure the voltage drop from the housing of the generator to the negative terminal on the battery. Refer to Circuit Testing and Connector Repairs in wiring repairs.

Does the voltage measure greater than the specified value?

0.5 V

Go to Step 11

Go to Step 14

Repair the output circuit of the generator for a high resistance or an open. Refer to Circuit Testing and Connector Repairs in wiring repairs.

Did you complete the repair?

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Go to Step 14

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Repair the ground circuit of the generator for a high resistance or an open. Refer to Circuit Testing and Connector Repairs in wiring repairs.

Did you complete the repair?

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Go to Step 14

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Inspect for poor connections at the harness connector of the generator.

Did you find and correct the condition?

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Go to Step 14

Go to Step 13

Replace the generator. Refer to Generator Replacement .

Is the repair complete?

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Go to Step 14

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Operate the vehicle within the Conditions for Running the symptom as specified in the supporting text.

Does the symptom reoccur?

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Go to Step 2

System OK