F 350 2WD Super Duty V10-6.8L (2009)
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to AA3.
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AA3 CHECK THE TRAILER TOW PARKING LAMP RELAY
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Place the headlamp switch in the OFF position.
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Disconnect: Trailer Tow Parking Lamp Relay.
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Substitute a known good relay.
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Place the headlamp switch in the PARKING LAMPS ON position.
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Measure the voltage between the trailer tow C4099-6, circuit CAT17 (BN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new trailer tow parking lamp relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to AA4.
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AA4 CHECK THE TRAILER TOW PARKING LAMP RELAY INPUT CIRCUIT FOR AN OPEN
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Place the headlamp switch in the PARKING LAMPS ON position.
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Measure the voltage between the trailer tow parking lamp relay pin 85, circuit CLS30 (VT/WH), BJB face side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AA5.
No
REPAIR the circuit. TEST the system for normal operation.
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