F 350 2WD Super Duty V10-6.8L (2009)
GO to AC2.
No
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
-------------------------------------------------
AC2 CHECK THE SUSPECT RELAY
-
Ignition OFF.
-
Disconnect: Suspect Trailer Tow Relay.
-
Carry out the component test for the suspect trailer tow relay.
-
Is the trailer tow relay OK?
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 trailer tow relay in question. TEST the system for normal operation.
-------------------------------------------------
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
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Refer to Wiring Diagram Set 11, Fuse and Relay Information for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The trailer battery charge relay coil receives voltage from the Smart Junction Box (SJB) fuse 33 (10A) through circuit CBP33 (WH/BN) when the
ignition switch is in the RUN position. Ground for the trailer battery charge relay coil is supplied through circuit GD122 (BK). The Battery Junction Box
(BJB) fuse 44 (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 through circuit CAT14 (OG).
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
Trailer tow connector
-
Trailer battery charge relay
-
Trailer
-
SJB
PINPOINT TEST AD: THE TRAILER BATTERY CHARGING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Before beginning diagnostics, visually inspect the trailer tow connector mounted on the bumper for signs of corrosion or damage. Repair or
install a new trailer tow connector as required.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.