ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 7127 > < Initial Inspection and Diagnostic Overview|Page 7125
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PINPOINT TEST AB: THE TRAILER LAMPS ARE ON CONTINUOUSLY

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.

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AB1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR

-

Ignition ON.

-

Measure the voltage the between trailer tow connector, harness side and ground as follows:

-

Is any voltage present?

Yes

GO to AB2.

No

The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.

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AB2 CHECK THE SUSPECT RELAY

-

Ignition OFF.

-

Disconnect: Suspect Trailer Tow Relay.

-

Ignition ON.

-

Measure the voltage the between trailer tow connector, harness side and ground as follows:

-

Is any voltage present?

Yes

REPAIR circuit CAT06 (YE) (LH turn), circuit CAT09 (GN) (RH turn), or circuit CAT11 (BN) (parking lamps) for a short to voltage. TEST the system
for normal operation.

No

INSTALL a new trailer tow relay in question. TEST the system for normal operation.

Initial Inspection and Diagnostic Overview|Page 7127 > < Initial Inspection and Diagnostic Overview|Page 7125