Expedition 2WD V8-5.4L (2009)
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Is any voltage present?
Yes
GO to AC2.
No
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
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AC2 CHECK THE TRAILER TOW RELAY
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Ignition OFF.
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Disconnect: Suspect Trailer Tow Relay.
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Measure the voltage between the trailer tow 4-pin connector, harness side and ground as follows:
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Is any voltage present?
Yes
REPAIR circuit CAT06 (YE) (LH turn), circuit CAT09 (OG) (RH turn), or circuit CAT11 (BN) (parking lamps) for a short to voltage. TEST the system
for normal operation.
No
INSTALL a new turn trailer tow relay. TEST the system for normal operation.
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Pinpoint Test AD: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
Trailer Lamps
Pinpoint Tests
Pinpoint Test AD: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
Normal Operation
