Operation CHARM
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Ford Truck
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1988
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F 150 4WD Pickup L6-300 4.9L
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Repair and Diagnosis
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Starting and Charging
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Charging System
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Testing and Inspection
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Pinpoint Tests
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B: Series With Internal Voltage Regulator (IVR)
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B9 - I Circuit Tests
B9 - I Circuit Tests
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Perform I circuit tests.
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I circuit tests OK?
YES --
Replace regulator. Go to B2.
B2 - Base Voltage and No Load Test
NO --
Service vehicle I circuit wiring. GO to B2.
B2 - Base Voltage and No Load Test