Check Gauges Indicator

The Instrument Cluster's internal circuitry monitors three inputs for determining when to illuminate the "CHECK GAUGES" Indicator.

The "CHECK GAUGES" Indicator is provided a ground for illumination when:
1. The Coolant Temperature Sensor indicates above-normal temperature (252-F for V6 VIN K or 244-F for V8 VIN P).
2. The Instrument Cluster senses the Generator turn-on input is at ground potential. The Generator pulls CKT 225 low with system voltage at or below 11.2V or with 16.5V or higher, also pulled low if Generator is stopped.
3. The Oil Pressure Sensor indicates below-normal pressure. The minimum rating for the pump is 8.3 psi, though the sensor will be approximately 3 to 5 psi at 10 ohms which will cause the "CHECK GAUGES" Indicator to illuminate (maximum pressure should be about 90 ohms at the sensor).
4. The Instrument Cluster performs a bulb check function for approximately one second after Ignition "ON."