Do not smoke or use an open flame in
the vicinity when servicing the batteries.
Batteries generate hydrogen, a highly
explosive gas. Failure to observe this
warning may result in serious injury to
Check the electrolyte for proper level (fig 3-10)
and see that the batteries are properly charged (TM 9-
6140-200-15). The danger of freezing depends on the
specific gravity of the electrolyte.
Water added to a battery will freeze
unless it is mixed by charging. Do
not add water unless the engine is to
be operated immediately afterwards
for at least 1 hour.
Make sure the battery cap vents are not clogged.
See that the battery terminal clamps are tight,
clean, and lightly coated with a general purpose grease
to retard corrosion.
Make sure the Battery Terminal Covers, NSN
5940-00-738-6272, are installed over the battery
terminals before installing cables.
Figure 3-10. Battery servicing.
The 6TN and 6TL batteries can be
maintenance-free batteries cannot be
mixed or matched with military batteries.
The 6TN and or the 6TL batteries will
perform properly in hot weather as long
monitored. If the electrolyte expands
and causes the level to rise, some fluid
must be removed. If the level becomes
too low due to evaporation, distilled
water may be used to obtain proper
level. A good grade of drinking water
(excluding mineral waters) may be used
if distilled water is not available.
Electrolyte (NSNs 6810-00-249-
9354 and 6810-00-843-1640) have a
specific gravity of 1.280 and should be
used in these batteries. Do NOT adjust
the electrolyte in wet batteries to a lower
Optional Battery Installation. See Figure 3-11.
Two 12 volt batteries can be installed for optional use in
cold climate where hard starting is prevalent.
Section IX. ELECTRICAL PANELS AND CONTROLS
operator/crew maintenance instructions for the electrical
Inspection. Inspect the voltage regulator
control box components for cracks, breaks, defective
wiring, and wear. For testing and replacement of parts,
refer to organization or field maintenance as allocated by
the Maintenance Allocation Chart (MAC).
Change 9 3-17