Control Switch
- Disconnect six-way connector at amplifier. Check battery voltage at light blue/black hash wire when "ON" switch is depressed. Battery voltage should be available from light blue/black hash wire leading from control switches.
- Connect an ohmmeter between light blue/black hash wire and ground. Check wire for continuity to ground with "OFF" switch depressed. If resistance higher than 1 ohm is found, the wiring, slip rings or switch is at fault, or steering column may not be properly grounded. To check steering column ground, connect an ohmmeter between a good body ground and steering column upper flange. Resistance should be less than 1/2 ohm. Rotate steering wheel and check flexible coupling resistance. 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 the remaining tests.
- With ohmmeter connected between light blue/black hash wire and ground, depress "SET-ACC" button. A reading of approximately 680 ohms should be indicated on ohmmeter. Depress "COAST" button and a reading of approximately 120 ohms should be indicated on ohmmeter.