E 450 V8-5.4L (2009)
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For vehicles equipped with a class I trailer tow package, while applying the brake pedal, measure the voltage between the trailer tow C4098-2,
circuit CAT06 (YE), harness side and ground.
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For vehicles equipped with a class II trailer tow package, while applying the brake pedal, measure the voltage between the trailer tow connector
LH stop/turn lamp voltage supply pin, circuit CAT06 (YE), component side and ground.
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Is the voltage greater than 10 volts?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
For vehicles equipped with a class I trailer tow package, GO to T4.
For vehicles equipped with a class II trailer tow package, GO to T3.
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T3 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (7-PIN) (LH TURN)
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Disconnect: Trailer Tow C4099.
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While applying the brake pedal, measure the voltage between the trailer tow C4099-1, circuit CAT06 (YE), 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 T4.
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T4 CHECK THE LH TRAILER TOW TURN RELAY
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Disconnect: LH Trailer Tow Stop/Turn Relay.
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Substitute a known good relay.
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For vehicles equipped with a class I trailer tow package, while applying the brake pedal, measure the voltage between the trailer tow C4098-2,
circuit CAT06 (YE), harness side and ground.