Batteries can be totally discharged within four to
six hours if air cleaner blower motor system is
malfunctioning or if blower motors operate full
time. Troubleshooting step K provides a basic test
of the blower motor circuit by testing the blower
motor relay output voltage to the voltage
regulator (wire 27B). If the blower motor relay out-
put is 24 vdc (battery power) with the voltage
regulator disconnected from the circuit, then the
voltage regulator is malfunctioning/inoperative
and will not charge the battery. If the voltage is
less than 24 vdc (battery power), then the blower
motor circuit is malfunctioning and discharging
the battery.
L Do not check or adjust voltage regulator except as follows:
Make sure batteries are fully charged
(TM 9-2350-267-10).
TA312704
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Change 1
TM 9-2350-267-20
