Expedition 2WD V8-5.4L (2009)
Yes
GO to AD6.
No
REPAIR circuit GD123 (BK/GY) for an open. TEST the system for normal operation.
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AD6 CHECK FOR VOLTAGE TO THE TRAILER BATTERY CHARGE RELAY COIL (INOPERATIVE CONDITION)
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Ignition ON.
-
Measure the voltage between the trailer battery charge relay pin 1, circuit CAT23 (GN/YE), BJB face side and ground.
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit CAT14 (OG) for an open. TEST the system for normal operation.
No
VERIFY the SJB fuse 44 (10A) is OK. If OK, GO to AD7. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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AD7 CHECK THE TRAILER BATTERY CHARGE RELAY COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
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Ignition OFF.
-
Disconnect: SJB C2280b.
-
Measure the resistance between the trailer battery charge relay pin 1, circuit CAT23 (GN/YE), BJB face side and the SJB C2280b-6, circuit
CAT23 (GN/YE), harness side.
-
Is the resistance less than 5 ohms?
Yes
GO to AD12.
No
REPAIR circuit CAT23 (GN/YE) for an open. TEST the system for normal operation.
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AD8 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR (BATTERY CHARGE ALWAYS ON)
-
Ignition OFF.
-
Measure the voltage between the trailer tow connector pin 5, circuit CAT14 (OG), component side and ground.
