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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B6 - A Terminal Voltage Check
B6 - A Terminal Voltage Check
^
Reconnect regulator.
^
Measure A terminal voltage.
No voltage --
Service A circuit wiring.
Battery voltage --
Go to B7.
B7 - F Terminal Voltage Check With Key Off