E 450 V8-5.4L (2009)
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Is the voltage greater than 10 volts?
Yes
GO to X8.
No
GO to X2.
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X2 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 X3.
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X3 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.
-
Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new trailer battery charge relay. TEST the system for normal operation.
