F 350 2WD Super Duty V10-6.8L (2009)
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AD1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR (BATTERY CHARGE INOPERATIVE)
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Ignition ON.
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Measure the voltage between the trailer tow connector battery charge voltage supply pin, circuit CAT14 (OG), component side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AD8.
No
GO to AD2.
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AD2 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR (BATTERY CHARGE INOPERATIVE)
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Ignition OFF.
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Disconnect: Trailer Tow C4099.
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Ignition ON.
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Measure the voltage between the trailer tow C4099-5, circuit CAT14 (OG), 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 AD3.
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AD3 CHECK THE TRAILER BATTERY CHARGE RELAY (INOPERATIVE)
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Ignition OFF.
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Disconnect: Trailer Battery Charge Relay.
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Substitute a known good relay.
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Ignition ON.
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Measure the voltage between the trailer tow C4099-5, circuit CAT14 (OG), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
