Pinpoint Test A: No Power In All Ignition Switch Positions

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

A1 CHECK FOR VOLTAGE AT SJB FUSE 27 (20A)
- Ignition OFF.
- Disconnect: SJB Fuse 27 (20A).
- Measure the voltage between SJB fuse 27 (20A), input side and ground.
  
  Fig 1: Measuring Voltage Between SJB Fuse 27 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to A2 .
- No: INSTALL a new SJB . REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.
A2 CHECK FOR VOLTAGE TO THE IGNITION SWITCH
- Connect: SJB fuse 27 (20A).
- Disconnect: Ignition Switch C250.
- Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground.
  
  Fig 2: Checking Circuit SBP27
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: INSTALL a new ignition switch. REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.
- No: VERIFY SJB fuse 27 (20A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short. TEST system for normal operation.