MOTOR TRUCK SERVICE MANUALELECTRICAL
should be applied as follows for a 10-minute period:
6-Volt Batteries - 50 to 70 amperes
12-Volt Batteries - 30 to 40 amperes
If a high- rate charger is not available, charge at 15
amperes for 30 minutes.
REMOVA L AND INSTALLATION
Selecting the Size
Batteries sold for replacement should be of an
electrical size at least equal to battery placed in vehicle
by the manufacturer. Frequently additional current-
consuming devices have been added to the vehicle by
the owner, which may make a larger capacity battery
Fig. 14 Using Terminal Puller
In order to avoid damage to battery, pry terminal
Also the drain on battery may be very high when
jaws apart or apply a terminal puller, Fig. 14, to remove
cable. Don't hammer or pry up on clamps, as this can
generators carry the electrical load when the engine is
damage post seals and break cover.
running, but too small a battery may be discharged so
much by lights and miscellaneous current draws while
parked that cold weather starting is seriously impaired
before the driving time allows the generator to restore
the charge to the battery. A larger battery will also have
longer life and, therefore, be a worthwhile investment.
Make sure larger battery will fit the application.
Removing Old Battery
When removing old battery note the location of
positive terminal so that new battery is installed in the
same manner. Remove "ground" terminal first.
Fig. 15 Cleaning Ground Connection Using an Old File
Ground to a Sharp, Blunt Edge
Inspect the cradle for damage caused by corrosion
from loss of acid from old battery. Be sure hold-downs
are mechanically strong and free of corrosion. Corroded
parts and cables may be cleaned with a mixture of water
and household ammonia or baking soda by scrubbing
with a stiff brush.
Also check cables to see that insulation is intact and
Fig. 13 Loosening Battery Terminals
the clamp terminal or its bolt are not damaged by
corrosion. Clean the ground terminal, Fig. 15, at the
In removing hex nut on the bolt of clamp terminal,
frame and tighten; also the switch and starter
use only a properly fitted end wrench or special battery
clamp pliers, Fig. 13.