F 150 4WD V8-4.6L VIN 8 (2010)
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Is the voltage greater than 10 volts?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
VERIFY the BJB fuse 58 (15A) is OK. If OK, GO to AB2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
See: Diagrams/Electrical Diagrams/Diagrams By Number
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AB2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR
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Disconnect: Trailer Tow C439a.
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Measure the voltage between the trailer tow C439a-7, circuit CAT03 (GY/BN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to AB3.
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AB3 CHECK FOR VOLTAGE TO THE BJB FUSE 58 (15A)
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Measure the voltage between the BJB fuse 58 (15A), circuit CAT16 (GY/BN), input side and ground.
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit CAT03 (GY/BN) for an open. TEST the system for normal operation.
No
