F 350 2WD Super Duty V10-6.8L (2009)
AA5 CHECK THE TRAILER TOW PARKING LAMP RELAY BJB VOLTAGE SUPPLY
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Place the headlamp switch in the OFF position.
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Measure the voltage between the trailer tow parking lamp relay pin 30, BJB face side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AA6.
No
VERIFY the BJB fuse 42 (30A) is OK. If OK, INSTALL a new BJB. TEST the system for normal operation.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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AA6 CHECK FOR VOLTAGE TO THE TRAILER TOW PARKING LAMP RELAY USING THE GROUND CIRCUIT
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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.
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit GD122 (BK) for an open. TEST the system for normal operation.
No
REPAIR circuit CAT17 (BN) for an open. TEST the system for normal operation.
