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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A: Series With External Voltage Regulator (EVR)
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A4 - Batt Drain With Key Off
A4 - Batt Drain With Key Off
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Perform battery drain test.
Drain Testing
Battery drain --
Go to A5.
A5 - EVR Drain Test
No battery drain --
Visually inspect battery and perform load test.