All Other Models
- Disconnect 6-way connector at amplifier from steering control switch. Check battery voltage at Light Blue/Black wire with "ON" switch depressed. Battery voltage should be available from Light Blue/Black wire leading from control switches.
- Connect an ohmmeter between Light Blue/Black wire and ground. Check wire for continuity to ground with "OFF" switch depressed. If resistance higher than one ohm is found, wiring, slip rings or switch is at fault, or steering column may not be properly grounded.
- Check steering column ground, connect ohmmeter between ground and steering column upper flange. Resistance should be less than 1/2 ohm. Rotate steering wheel and check flexible coupling for resistance less than one ohm. If resistance higher than 3 ohms is noted, clean horn brush contacts and ground brush.
- Resistance readings of less than one ohm must be obtained before performing remaining tests. With ohmmeter connected between Light Blue/Black wire and ground, depress and hold "SET-ACCEL" switch. Reading should be 680 ohms.
- Depress and hold "COAST" switch. Reading should be 120 ohms. Depress and hold "RESUME" switch. Reading should be 2200 ohms.