5-11. BATTERY CHARGING CIRCUIT.
a. Description. Charging of the batteries is accomplished by a 14-volt, 85-ampere, self-load
limiting alternator with an integral transformer rectifier providing 24 volts for the cranking batteries
and 12 volts for other vehicle electrical loads. This system uses two sets of 12-volt batteries in series
to provide 24 volts for cranking. The cranking batteries are charged by the transformer rectifier unit,
and as the load demand on these batteries is cranking only, the 15 amperes available from the trans-
former rectifier is more than sufficient for this application. As the cranking batteries become charged,
the output current gradually drops to approximately one ampere when the terminal voltage of the
battery reaches 13.8 volts (adjustable). The charging circuit is shown in figure 5-28.
Figure 5-28. Battery Charging Circuit