Auxillary Tank Sensor Fault Tracing

- Remove battery negative lead.
- Unplug connector and measure with an ohmmeter between the white-gray leads. Resistance should be between 0 Ohm, with auxiliary tank empty, and 60 Ohm, with auxiliary tank full.
If resistance reads infinity, measure directly on the sensor terminals.
With resistance other than between 0 and 80 ohm, the sensor is faulty and needs changing.