Pinpoint Test G: The STOPLAMPS Are Inoperative

G1 CHECK THE VOLTAGE AT CJB FUSE 42
- Key in ON position.
- Measure the voltage between the CJB fuse 42 and ground.
  
  Fig 1: Measuring Voltage Between CJB Fuse 42 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to G2.
- No : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
G2 CHECK CIRCUIT 15S-LG14B (GN/RD) FOR AN OPEN
- Key in OFF position.
- Disconnect: Stoplamp Switch C2314.
- Key in ON position.
- Measure the resistance between the stoplamp switch C2314-1, circuit 15S-LG14B (GN/RD), harness side and ground.
  
  Fig 2: Measuring Resistance Between Stoplamp Switch C2314-1, Circuit 15S-LG14B (GN/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to G3.
- No : REPAIR the circuit. TEST the system for normal operation.
G3 CHECK THE STOPLAMP SWITCH
- Key in OFF position.
- Connect a fused (15A) jumper wire between the stoplamp switch C2314-3, circuit 15-LG23 (GN/WH), harness side and the stoplamp switch C2314-1, circuit 15S-LG14B (GN/RD), harness side.
  
  Fig 3: Checking Stoplamp Switch
  Courtesy of FORD MOTOR CO.
- Do the stoplamps illuminate?
- Yes : INSTALL a new stoplamp switch. REFER to STOPLAMP SWITCH . TEST the system for normal operation.
- No : REPAIR circuit 15S-LG14B (GN/RD). TEST the system for normal operation.