F 150 4WD V8-4.6L VIN 8 (2010)
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Is the voltage greater than 10 volts?
Yes
GO to AD7.
No
REPAIR circuit GD123 (BK/GY) for an open. TEST the system for normal operation.
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AD7 CHECK FOR VOLTAGE TO THE TRAILER BATTERY CHARGE RELAY COIL (INOPERATIVE CONDITION)
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Ignition ON.
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Measure the voltage between the trailer battery charge relay pin 1, circuit CBB54 (VT/OG), BJB face side and ground.
