THEORY OF OPERATION - CONTINUED
The cooling system consists of one circulating pump, a remote-mounted coolant filter, two 180°F (82°C) thermostats for con-
trolling fluid flow, a transmission oil cooler, a radiator, and a belt-driven fan. The cooling system cools the engine by circulat-
ing 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 connectors.
The Dual Voltage Alternator Control (DUVAC), mounted on the firewall in the engine compartment, regulates the dis-
tribution of 12 and 24 volts.
DDEC IV ENGINE