Explorer Sport Trac 2WD V6-4.0L (2009)
PINPOINT TEST AC: THE TRAILER BATTERY CHARGING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Before beginning diagnostics, visually inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow
connector as required.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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AC1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTION (BATTERY CHARGE INOPERATIVE)
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Ignition OFF.
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Disconnect the trailer from the vehicle.
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Ignition ON.
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Measure the voltage between the trailer tow connector pin 5, circuit CAT14 (OG), component side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AC8.
No
VERIFY the BJB fuse 13 (30A) is OK. If OK, GO to AC2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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AC2 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 the trailer battery charge relay with a known good relay.
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Ignition ON.
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Measure the voltage between the trailer tow connector pin 5, circuit CAT14 (OG), component side and ground.
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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.
No
REMOVE the known good relay. INSTALL the original relay. GO to AC3.
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