F 350 2WD Super Duty V10-6.8L (2009)
Z2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (VEHICLE HARNESS)
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Disconnect: Trailer Tow C4099.
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For the LH trailer stop/turn lamp, while applying the brake pedal, measure the voltage between the trailer tow C4099-1, circuit CAT06 (YE),
harness side and ground.
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For the RH trailer stop/turn lamp, while applying the brake pedal, measure the voltage between the trailer tow C4099-4, circuit CAT09 (GN),
harness side 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 Z3.
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Z3 CHECK THE TRAILER TOW STOP/TURN RELAY
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Disconnect: Suspect Trailer Tow Stop/Turn Relay.
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Substitute a known good relay.
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For the LH trailer stop/turn lamp, while applying the brake pedal, measure the voltage between the trailer tow C4099-1, circuit CAT06 (YE),
harness side and ground.
-
For the RH trailer stop/turn lamp, while applying the brake pedal, measure the voltage between the trailer tow C4099-4, circuit CAT09 (GN),
harness side and ground.
-
Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new trailer tow stop/turn relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to Z4.
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Z4 CHECK THE TRAILER TOW STOP/TURN RELAY INPUT CIRCUIT FOR VOLTAGE
