F 350 2WD Super Duty V10-6.8L (2009)
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Is any voltage present?
Yes
GO to AD11.
No
INSTALL a new trailer battery charge relay. TEST the system for normal operation.
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AD11 CHECK THE TRAILER BATTERY CHARGE RELAY COIL SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
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Disconnect: SJB C2280b.
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Measure the voltage between the trailer battery charge relay pin 85, circuit CBP33 (WH/BN), BJB face side and ground.
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Is any voltage present?
Yes
REPAIR circuit CBP33 (WH/BN) for a short to voltage. TEST the system for normal operation.
No
GO to AD12.
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AD12 CHECK FOR CORRECT SJB OPERATION
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Disconnect all the SJB connectors.
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Check for:
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corrosion
