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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1928 (Exterior Lighting System (F250-F550)) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test AA: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps >> Pinpoint Test Aa: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps

Pinpoint Test Aa: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. AA1 CHECK CIRCUIT 963 (BK/LG) FOR VOLTAGE 
    • Disconnect: Trailer Tow C4099 (7-Pin)
    • Apply the parking brake.
    • Key in ON position.
    • Place the transmission in REVERSE.
      • Fig 1: Checking Circuit For Voltage
      GF0004639Courtesy of FORD MOTOR CO.
    • Measure the voltage between the trailer tow C4099-7, circuit 963 (BK/LG), harness side and ground.
    • 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 BJB fuse 20 (10A) is OK. If OK, go to  AA2 .
  2. AA2 CHECK FOR VOLTAGE TO THE BJB FUSE 20 (10A) 
    • Measure the voltage between the BJB fuse 20 (10A), circuit 140 (BK/PK), input side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR circuit 140 (BK/PK). TEST the system for normal operation.
    2. NO  : REPAIR circuit 963 (BK/LG). TEST the system for normal operation.
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