THEORY OF OPERATION - CONTINUED
The cooling system consists of one circulating pump, a remote-mounted coolant filter, two
180°F (82°C) thermostat for controlling fluid flow, a transmission oil cooler, a radiator, and a
belt-driven fan. The cooling system cools the engine by circulating pressurized ethylene glycol
based coolant through the engine and radiator.
Four 12-volt batteries connected in series-parallel supply the 12-volt electrical system
and provide 24 volts for the starter motor, blackout lights, accessories, and trailer connec-
The Dual Voltage Alternator Control (DUVAC), mounted on the firewall in the engine
compartment, regulates the distribution of 12 and 24 volts.
DDEC IV ENGINE