2008 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 277

STARTING AND OPERATING 275 • Voltmeter Operation: 1. The voltmeter may show a gauge fluctuation if certain engine temperatures are below 66°F (19°C). This cycling operation is caused by the post-heat cycle of the intake manifold heater system. The number of cycles and the length of the cycling operation is controlled by the engine control module. Post-heat operation can run for several minutes, and then the electrical system and voltmeter needle will stabilize. 2. The cycling action will cause temporary dimming of the headlamps, interior lamps, and also a noticeable reduction in blower motor speed. Cold Weather Precautions Operation in ambient temperature below 32°F (0°C) may require special considerations. The following charts suggest these options: Fuel Operating Range (6.7L Diesel Engine) NOTE: Use "Ultra Low Sulfur Diesel Fuels" ONLY. 5 *No. 1 Ultra Low Sulfur diesel fuel should only be used where extended arctic conditions (-10°F/-23°C) exist. NOTE: • Use of Climatized Ultra Low Sulfur Diesel Fuel or Number 1 Ultra Low Sulfur Diesel Fuel results in a noticeable decrease in fuel economy.