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HEADLIGHT REMOVAL
TM 5-4210-230-14&P-1 VEHICLE MAINTENANCE ELECTRICAL ALTERNATOR IMPORTANT Before   connecting   a   fast   charger,   booster battery or installing a new battery, make sure that  the  ground  polarities  of  the  fast  charger, booster battery or alternator (when installing a battery) are matched to the ground polarity of the  vehicle  battery.    Improper  usage  of  fast charger, hook-up of booster battery or installing   battery   can   cause   damage   to   the electrical system or to the alternator.  Do not attempt to polarize the alternator. ALTERNATOR BELT ADJUSTMENT For  proper  belt  deflection  refer  to  Fan  and  Accessory Belt Adjustment under Engine. BATTERY The  solution  in  each  cell  should  be  to  the  indicator level.    When  the  solution  is  below  this  level,  add  distilled water, using a clean syringe.  Acid or electrolyte should never be added except by skilled personnel. Under    no    circumstances    add    any    special    battery "dopes", solutions or powders. Test  the  specific  gravity  of  the  electrolyte  in  each  cell with   a   hydrometer   at   least   once   a   month.      A   hydrometer reading  of  1.260  at  27  deg.    C  (80  deg  F)  indicates  a  full charge.   Never   allow   the   battery   to   fall   below   1.225   which indicates half charged.  A discharged battery will freeze at -7 deg.    C  (20  deg.    F).    A  fully  charged  battery  will  withstand temperatures as low as -62 deg.  C (-80 deg.  F). Battery  cable  terminals  must  be  clean  and  tight.    Use hot  water  and  common  baking  soda  for  removing  terminal corrosion and for cleaning the top of the battery.  Brighten the contact surface with steel wool, apply a light coat of vaseline or  chassis  lubricant  and  reassemble.    Be  sure  the  terminals are clamped tightly and that battery is clamped securely in the battery box. When  working  around  the  terminals  and  battery,  use extra  care  to  avoid  shorting.    A  good  practice  is  to  insulate pliers    and    screwdrivers.        DO    NOT    CHECK    BATTERY CONDITION BY SHORTING (FLASHING) ACROSS TERMINALS. CAUTION To   prevent   severe   injury   to   the   eyes,   face limbs  and  body,  due  to  a  fire  or  dangerous explosion     from     flames     or     sparks,     it     is imperative that flames or sparks be kept away from the vent openings of the battery.  This is particularly true when jumper cables are being used. In addition, inhaling of hydrogen gas produced    in    the    normal    operation    of    the battery   could   result   in   partial   or   permanent damage to the respiratory system. WHEN INSPECTING BATTERY, NEVER SMOKE OR EXPOSE BATTERY TO SPARKS OR FLAMES, AS THE GAS MIXTURE IN EACH CELL OF THE BATTERY WHICH  EXCAPES  THROUGH  THE  HOLES IN THE VENT PLUGS CAN IGNITE, CAUSING   AN   INTERNAL   EXPLOSION   OF THE BATTERY. Whenever    disconnecting    battery    terminals, always disconnect GROUND TERMINAL FIRST.    When  reconnecting,  always  connect GROUND TERMINAL LAST. ALWAYS  WEAR  EYE  PROTECTION  WHEN WORKING   AROUND   BATTERIES.      Do   not attempt   to   jump   start   a   vehicle   having   a frozen    battery,    because    the    battery    may rupture   or   explode.      If   a   frozen   battery   is suspected,    examine    all    fill    vents    on    the battery.  If ice can be seen, do not attempt to start with jumper cables as long as the battery remains   frozen.      Thaw   out   battery,   fill   with water  and  recharge.    Failure  to  observe  the above instructions could result in any or all of the aforementioned injuries. CIRCUIT BREAKERS OR FUSES The   various   electrical   units   are   protected   by   either fuses or circuit breakers located under the instrument panel to the left of the driver. A  fuse  panel  for  trailer  connections  is  located  on  the cab behind the driver. ENGINE INITIAL TIMING To  assure  efficient  operation  of  the  engine  the  timing should be checked with a timing light attachment No.  1 (right front) spark plug on MV-404, MV-446, No.  1 left front spark plug on V-537 engines and No.  8 (right rear) spark plug on V- 345 and V-392. Refer   to   "Emission   Control   Information"   label   in   the engine compartment for timing. 7

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