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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1831 (Exterior Lighting System) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test X: The Trailer Battery Charging Is Inoperative >> Pinpoint Test X: The Trailer Battery Charging Is Inoperative

Pinpoint Test X: The Trailer Battery Charging Is Inoperative

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. X1 CHECK THE VOLTAGE TO THE TRAILER TOW CONNECTOR 
    • Disconnect: Trailer Tow C439a
    • Key in ON position.
    • Measure the voltage between the trailer tow C439a-5, circuit 49 (OG), harness side and ground.
      • Fig 1: Checking Voltage To Trailer Tow Connector
      GF0004643Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
    2. NO  : VERIFY the CJB fuse 106 (30A) is OK. If OK, go to  X2 .
  2. X2 CHECK THE TRAILER TOW BATTERY CHARGING RELAY 
    • Key in OFF position.
    • Disconnect: Trailer Tow Battery Charging Relay
    • Carry out the trailer tow battery charging relay component test. Refer to COMPONENT TESTING.
    • Is the relay OK? 
    1. YES  : Go to  X3.
    2. NO  : INSTALL a new trailer tow battery charging relay. TEST the system for normal operation.
  3. X3 CHECK FOR VOLTAGE TO THE TRAILER TOW BATTERY CHARGING RELAY 
    • Key in ON position.
    • Measure the voltage between the trailer tow battery charging relay pin 86, harness side and ground; and between the trailer tow battery charging relay pin 30, harness side and ground.
      • Fig 2: Checking For Voltage To Trailer Tow Battery Charging Relay
      GF0004644Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  X4.
    2. NO  : VERIFY the CJB fuse 13 (10A) is OK. If OK, REPAIR or INSTALL a new CJB. TEST the system for normal operation.
  4. X4 CHECK THE TRAILER TOW BATTERY CHARGING RELAY FOR GROUND 
    • Key in OFF position.
    • Measure the resistance between the trailer tow battery charging relay pin 85, circuit 57 (BK), harness side and ground.
      • Fig 3: Checking Trailer Tow Battery Charging Relay For Ground
      GF0004645Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  X5.
    2. NO  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
  5. X5 CHECK CIRCUIT 49 (OG) FOR AN OPEN 
    • Disconnect: CJB C270n
    • Connect a fused (30A) jumper wire between the trailer tow battery charge relay pin 30, harness side and the trailer tow battery charge relay pin 87, circuit 49 (OG), harness side.
      • Fig 4: Checking Circuit 49 (OG) For An Open (1 Of 2)
      GF0004646Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Measure the voltage between the CJB C270n pin 4, circuit 49 (OG), component side and ground.
      • Fig 5: Checking Circuit 49 (OG) For An Open (1 Of 2)
      GF0004647Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
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