Pinpoint Test I: The Speed Control Indicator Lamp Is Always On

I1 CHECK THE SPEED CONTROL SERVO
- Key in OFF position.
- Disconnect: Speed Control Servo C122.
- Key in ON position.
- Check the speed control indicator lamp.
- Is the speed control indicator lamp always on?
- Yes : GO to I2.
- No : INSTALL a new speed control servo. REFER to SPEED CONTROL SERVO in this article. TEST the system for normal operation.
I2 CHECK CIRCUIT 203 (OG/LB) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Instrument Cluster C220c.
- Measure the resistance between the speed control servo C122 pin 1, circuit 203 (OG/LB), harness side and ground.
  
  Fig 1: Measuring Resistance Between Speed Control Servo C122 Pin 1, Circuit 203 (OG/LB), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.