F 350 2WD Super Duty V10-6.8L (2009)
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While applying the brake pedal, measure the voltage between the trailer tow C4099-3, circuit CAT19 (BU), 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 AE5.
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AE5 CHECK FOR VOLTAGE TO THE TRAILER ELECTRIC BRAKE CONTROLLER
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Disconnect: Trailer Electric Brake Controller C2142.
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Measure the voltage between the trailer electric brake controller C2142-8, circuit SBB05 (GY/RD), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AE6.
No
VERIFY the BJB fuse 5 (30A) is OK. If OK, REPAIR circuit SBB05 (GY/RD) for an open. 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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AE6 CHECK THE STOPLAMP SWITCH INPUT TO THE TRAILER ELECTRIC BRAKE CONTROLLER
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While applying the brake pedal, measure the voltage between the trailer electric brake controller C2142-10, circuit CLS43 (YE/GN), harness side
and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AE7.
No
REPAIR circuit CLS43 (YE/GN) for an open. TEST the system for normal operation.
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AE7 CHECK FOR VOLTAGE TO THE TRAILER ELECTRIC BRAKE CONTROLLER USING THE CONNECTOR GROUND
