TRUCK SERVICE MANUAL
Boost charge 12-volt batteries at 15 amps (6-volt and
12-volt heavy duty batteries at 30 amps) until the
specific gravity of the electrolyte is 1.250 or higher and
electrolyte temperature is at least 15.5°C (60°F). BOTH
CONDITIONS MUST BE MET. If electrolyte bubbles
violently while charging, reduce charging rate until
excessive bubbling action subsides, then continue
charging until 1.250 specific gravity and 15.5°C (60°F)
If the ambient temperature is 0°C (32°F) or less, it is
imperative that the above instructions be followed.
Check volume of electrolyte in all cells and adjust to
prescribed level with additional electrolyte as required.
Install battery in vehicle as instructed under REMOVAL
AND INSTALLATION. Be sure of proper polarity.
Dry charged batteries may be placed in service
immediately after activation. However, to insure good
performance these additional steps are recommended.
Check the specific gravity of all cells. Under good
storage conditions, the electrolyte specific gravity on
activating a dry-charged battery will drop approximately
.010 and temperature will rise 4° to 5.6°C (7° to 10°F)
within twenty minutes of filling the battery. A battery
under these conditions requires little boost charging.
However, should the specific gravity drop .030 or more
with a corresponding increase in temperature, the
negative plates have been oxidized and the battery
should be fully recharged before use. Also, the battery
should be recharged if one or more cells gas violently
after the addition of electrolyte. After electrolyte is
added, check the open circuit terminal voltage of the
battery. If a 12-volt battery reads less than 10 volts
(less then 5 volts on a 6-volt battery) this indicates a
reverse cell or an "open" circuit and the battery should
After the dry charged battery has been activated, it
must be serviced, handled and kept charged like any
other wet battery. After battery has been in service, add
only approved water. DO NOT ADD ACID.
CTS-2771 Page 18
PRINTED IN UNITED STATES OF AMERICA