F 150 4WD V8-4.6L VIN 8 (2010)
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
GO to AD3.
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AD3 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR (BATTERY CHARGE INOPERATIVE)
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Ignition OFF.
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Disconnect: Trailer Tow C439a.
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Ignition ON.
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Measure the voltage between the trailer tow C439a-5, circuit CAT14 (OG) 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 AD4.
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AD4 CHECK THE TRAILER BATTERY CHARGE RELAY (INOPERATIVE)
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Ignition OFF.
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Disconnect: Trailer Battery Charge Relay.
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Substitute a known good relay.
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Ignition ON.
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Measure the voltage between the trailer tow C439a-5, circuit CAT14 (OG) and ground.
-
Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new trailer battery charge relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to AD5.
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AD5 CHECK FOR VOLTAGE TO THE TRAILER TOW BATTERY CHARGE RELAY