Electrical 389 Family
Peterbilt Motors Company 6-13
Transmission Oil Temperature, Auxiliary The Auxiliary Transmission Oil Temperature gauge indicates the temperature
of the oil in the auxiliary transmission.
Transmission Retarder Oil Temperature The Transmission Retarder Oil Temperature gauge indicates the temperature
of the oil in the transmission retarder.
Voltmeter The Voltmeter displays the battery voltage. Normally, it shows 12 to 14V (volts). A red warning light in the
gauge illuminates when an out of range condition exists.
TABLE 6-3. Gauge Input Sources
Standard / Optional Input Source
Air Filter Restriction Pressure
Auxiliary Transmission Oil Temperature
Brake Application Pressure
Brake Saver Application Air Pressure
Brake Saver Oil Temperature (Not available with
CECU instrumentation)
Drive Axle Oil Temperature
Engine Coolant Temperature
Fuel Filter Restriction Pressure
Main Transmission Oil Temperature
Manifold Pressure (Boost)
Primary & Secondary Air Pressure
Pyrometer (Exhaust Temperature) (Not available with
CECU instrumentation)
Suspension Load Air Pressure
Trailer Brake Application Air Pressure
Trailer Reservoir Air Pressure
Transfer Case Oil Temperature
* Sensor Types:
Active - Has 3 wires and requires power to operate. Output is a linear voltage.
Passive - Has 2 wires and does not require power to operate. Output is a change in resistance.
