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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.
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