Battery Temperature Sensor
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Dodge Ram Wagon, 1999 Dodge Ram Van, 1999 Dodge Pickup, 1999 Dodge Durango, and 1999 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect and remove Battery Temperature Sensor (BTS) for battery tray (driver's side tray on diesel equipped vehicle). Using external ohmmeter, measure resistance across component connector terminals. Resistance at room temperature should be 9000-11,000 ohms. Replace sensor as needed.