Control Switches Test

Disconnect blue lead going to amplifier from control switches. Check blue lead from control switches as follows:

1. Check for battery voltage at blue lead when ON switch is depressed. Battery voltage should be available at the blue lead coming from the control switches.
2. Connect an ohmmeter between blue wire and ground. Check blue wire for continuity to ground when OFF switch is depressed. If a resistance is found, wiring slip rings or switch is at fault. Rotate steering wheel back and forth and tilt column up and down (if equipped). If change in resistance is noted, clean horn brush contacts and the ground brush. A good resistance reading must be obtained before proceeding to Step 3. 
3. With ohmmeter connected between blue wire and ground, depress set-speed switch. A reading of approximately 680 ohms should be indicated on ohmmeter. Depress coast switch, a reading of approximately 120 ohms should be indicated on ohmmeter.