ON Circuit
- Measure voltage between Pin No. 5 at 6-pin amplifier connector and ground. See Figure . Battery voltage should exist when cruise control ON button is pressed. If battery voltage exists, go to next step. If battery voltage does not exist, perform CONTROL SWITCHES test. If control switches are okay, check Red/Yellow wire for open or short circuit.
- Release ON button. Voltmeter should indicate about 7.8 volts. Voltage should remain at 7.8 volts until another cruise control switch is pressed. If no voltage is present, check system ground wiring. See WIRING DIAGRAM. Install a known good amplifier, and recheck circuit.