5-7. BATTERY SYSTEM.
a Description. Four 12-volt, heavy-duty, maintenance-free batteries, (fig. 5-1 7) are located
in an enclosure in the right-hand frame rail under the cab. The batteries are connected in a series-
parallel combination to provide 24 volts for engine starting plus trailer lighting, and 12 volts for
operation of all of the electrical equipment on the vehicle. Water never needs to be added to the
maintenance-free batteries. There are no vent plugs in the cover. The batteries are completely
sealed except for a small vent hole in the side. The test indicator in the cover can be used to
determine if the battery is charged to the proper level for testing.
Figure 5-17. Battery System