F 150 4WD V8-4.6L VIN 8 (2010)
-
Is any voltage present?
Yes
GO to AC2.
No
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
-------------------------------------------------
AC2 CHECK THE TRAILER TOW RELAY
-
Ignition OFF.
-
Disconnect: Suspect Trailer Tow Relay.
-
Ignition ON.
-
Measure the voltage between the trailer tow 4-pin connector, harness side and ground as follows:
-
Is any voltage present?
Yes
REPAIR circuit CAT06 (YE) (LH turn), circuit CAT09 (GN) (RH turn) or circuit CAT17 (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.
-------------------------------------------------
Pinpoint Test AD: The Trailer Battery Charging Is Inoperative/Is Always Charging
Trailer Lamps
Pinpoint Tests
Pinpoint Test AD: The Trailer Battery Charging Is Inoperative/Is Always Charging
Normal Operation
The trailer battery charge relay coil receives voltage from the Battery Junction Box (BJB) fuse 54 (5A) when the ignition switch is in the RUN position.
The BJB fuse 21 (30A) supplies voltage to the trailer battery charge relay switch side. When the trailer battery charge relay is energized, the voltage is
routed to the trailer tow connector.