E 450 V8-5.4L (2009)
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X9 CHECK THE TRAILER BATTERY CHARGE VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
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Disconnect: Trailer Battery Charge Relay.
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Measure the voltage between the trailer tow connector battery charge voltage supply pin, circuit CAT14 (OG), component side and ground.
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Is any voltage present?
Yes
REPAIR circuit CAT14 (OG) for a short to voltage. TEST the system for normal operation.
No
GO to X10.
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X10 CHECK FOR VOLTAGE TO THE TRAILER BATTERY CHARGE RELAY COIL
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Measure the voltage between the trailer battery charge relay pin 1, circuit CBP44 (VT), BJB face side and ground.
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Is any voltage present?
Yes
GO to X11.
No
INSTALL a new trailer battery charge relay. TEST the system for normal operation.
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X11 CHECK THE TRAILER BATTERY CHARGE RELAY COIL SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
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Disconnect: SJB C2280e.
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Measure the voltage between the trailer battery charge relay pin 1, circuit CBP44 (VT), BJB face side and ground.
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Is any voltage present?
Yes
