TM  10-3930-638-24&P 1. RADIATOR. Mounted at rear of truck; cools engine 4. WATER PUMP. Driven by belt from crankshaft coolant. Includes a coolant recovery system. pulley. 2. THERMOSTAT AND HOUSING. Mounted on front 5. FAN. Mounted on water pump pulley; located behind of engine at rear of truck. Thermostat opens at 180 radiator. degrees F. 6.  DRIVE  BELT.  Installed  between  engine  crankshaft, 3. HOSES. Two hoses route coolant to and from radiator; water  pump  pulley  and  alternator  pulley;  drives  water one hose connected between top of radiator to top of pump  and  alternator. water pump; other hose connected from bottom of radiator to side of water pump. 1-19.   ELECTRICAL   SYSTEM 1. ALTERNATOR. 40 ampere; charges batteries and supplies  current  for  additional  electrical  power. 2.  DRIVE  BELT.  Drives  alternator  through  engine crankshaft pulley. 3.  STARTER  MOTOR.  Electric  motor  with  an  over running clutch. Solenoid is mounted on starter with an enclosed  shifting  mechanism. 4. INSTRUMENT PANEL. Refer to paragraphs 1-19a and 1-19b for a description of gages, lights, and switches mounted  on  instrument  panel. 5. LIGHTS. Mounted at rear of truck are two flood lights, two stop and tail lights, and two blackout stop and tail lights. Mounted at front of truck are four flood lights and one blackout light. Operation of all lights is controlled by VEHICLE LIGHTS switch mounted on instrument panel  plus  front  and  rear  flood  lights  have  individual switches. 6. SENDING UNITS. Includes oil pressure sending unit mounted on right of engine and fuel level sending unit mounted  in  fuel  tank. 7. HORN AND SWITCH. Electric horn operates from 24 Volts and is mounted at front of truck; horn switch located in steering wheel horn button applies 24 Volts to  horn  when  depressed. 8. BATTERIES. Two 12 Volt batteries connected in series  giving  a  24  Volt  electrical  power  supply. 1-9