TM 5-3810-207-20/TO 36C23-3-37-12 CHAPTER 7 CARRIER ENGINE MAINTENANCE INSTRUCTIONS Section I.  CARRIER ENGINE ELECTRICAL SYSTEM 199.  General    The electrical system is a 24-volt system and consists of     two     12-volt     batteries,     a     generator,     generator regulator,   starter   and   starter   solenoid,   distributor,   six spark   plugs,   lighting   system,   heater   control   system, panel  switches  and  gages,  and  wires  and  wire  cables. Electrical   energy   to   crank   the   engine   flows   from   the batteries    to    the    starter    solenoid    and    starter.        The generator  and  generator  regulator  supply  the  current  to keep  the  battery  at  the  proper  charge.    The  distributor and coil supply the electrical power to the engine spark plugs.    Current  flows  from  the  batteries  to  the  panel switches which control the lights and electrical accessory items.  For proper removal and installation of all   electrical   wiring   on   the   carrier   refer   to   the   wiring diagram, figure 1. 200.  Carrier Engine Distributor a. Removal. (1) Remove engine access panel (par. 316). (2) Remove     the     distributor     in     a     similar manner as described in paragraph 74. b. Cleaning and Inspection.  Clean and inspect the distributor (par. 74). c. Installation. (1) Install  the  distributor  in  a  similar  manner as described in paragraph 74. (2) Install engine access panel (par. 316). d. Service.      Service   the   distributor   (LO   5-3810- 207-20). 201.    Distributor  Coil,  Points,  Condenser,  Resistor, and Rotor Cap a. Removal.    Remove  the  distributor  coil,  points, condenser, resistor, and rotor cap in a similar manner as described in paragraph 75. b. Cleaning and Inspection.  Clean and inspect the distributor coil, points, condenser, resistor, and rotor cap (par. 75). c. Installation.    Install  the  distributor  coil,  points, condenser, resistor, and rotor cap (par. 75). d. Test.  Test the coil (par. 75). e. Engine Timing.  Time the engine (par. 75). 202.  Spark Plugs and Cables a. Removal.  Remove spark plugs and cables in a similar manner as described in paragraph 76. b. Cleaning   and   Inspection.      Clean   and   inspect spark plugs and cables (par. 76). c. Test.  Test the spark plugs (par. 76). d. Installation.    Install  the  spark  plugs  and  cables (par. 76). e. Adjustment.  Service the spark plugs (par. 76). 203.  Starter Solenoid a. Removal. Remove the starter solenoid assembly as instructed on figure 122. b. Cleaning and Inspection. (1) Clean all parts with an approved cleaning solvent and dry thoroughly. (2) Inspect  the  starter  solenoid  assembly  for proper   operation.      Replace   a   defective starter   solenoid   assembly   and   hardware as necessary. c. Installation.  Install the starter solenoid assembly as illustrated on figure 122. 163