Ranger 2WD V6-4.0L (2010)
Pinpoint Test V: The Trailer Parking Lamps Are Inoperative
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
When the parking lamps are on, the SJB provides voltage to the trailer tow connector.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
Trailer
-
SJB
PINPOINT TEST V: THE TRAILER PARKING LAMPS ARE INOPERATIVE
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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V1 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR
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Ignition OFF.
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Place the headlamp switch in the PARKING LAMPS ON position.
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Measure the voltage between the trailer tow C439-3, circuit CAT17 (BN/WH), harness 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
VERIFY the SJB fuse 2 (10A) is OK. If OK, GO to V2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
See: Diagrams/Electrical Diagrams/Diagrams By Number
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V2 CHECK THE TRAILER TOW PARKING LAMP CIRCUIT FOR AN OPEN
-
Place the headlamp switch in the OFF position.
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Disconnect: SJB C2280c.
-
Measure the resistance between the SJB C2280c-25, circuit CAT17 (BN/WH), harness side and the trailer tow C439-3, circuit CAT17 (BN/WH),
harness side.
