Control Switch Test

Disconnect 6-way connector and test Lt. blue-black wire leading to amplifier from control switches as follows:

1. Check for battery voltage at blue wire when "ON" switch is depressed. Battery voltage should be available at blue wire leading from the control switches.
2. Connect an ohmmeter between blue wire and ground. Check wire for continuity to ground when the "OFF" switch is depressed. If a resistance higher than 1 ohm is found, the wiring, slip rings, or switch is at fault, or steering column is not properly grounded. To check steering column ground, connect an ohmmeter to good body ground and steering column upper flange. Resistance should be less than 1/2 ohm. Rotate steering wheel and if equipped with tilt column, move up and down. If resistance higher than 3 ohms is noted, clean horn brush contacts and ground brush. A resistance less than 1 Ohm must be obtained before performing remaining tests.
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.