F 550 2WD Super Duty V10-6.8L (2009)
Trailer Lamps: Pinpoint Tests
Pinpoint Test Y: The Trailer Lamps Are Inoperative - All
Trailer Lamps
Pinpoint Tests
Pinpoint Test Y: The Trailer Lamps Are Inoperative - All
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The trailer tow connector receives ground through circuit RAT08 (WH). This circuit is the shared ground for all of the trailer lamps.
All the trailer lamp relays share a common ground through circuit GD122 (BK).
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Trailer tow connector
-
Trailer
PINPOINT TEST Y: THE TRAILER LAMPS ARE INOPERATIVE - ALL
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.
-------------------------------------------------
Y1 CHECK TRAILER TOW RELAYS COIL GROUND CIRCUIT FOR AN OPEN
-
Ignition OFF.
-
Disconnect: Trailer Tow Parking Lamp Relay.
-
Measure the voltage between the trailer tow parking lamp relay pin 30, BJB face side and the trailer tow parking lamp relay pin 86, circuit GD122
(BK), BJB face side.
-
Is the voltage greater than 10 volts?
Yes