a. Malfunctioning generator control unit.
Volt-loadmeter reads off scale in wrong direc-
a. Generator field magnetized in wrong direc-
Volt-loadmeter does not indicate.
a. Tripped circuit breaker.
b. Open volt-loadmeter lead.
c. Defective volt-loadmeter.
No power indicated with battery master switch
a. Battery discharged or defective.
b. Open circuit between battery and master
c. Master switch defective.
d. Defective relay.
e. Keylock switch off.
Power on with master switch in OFF position.
a. Master switch defective.
b. Relay contacts stuck.
Apparent loss of battery capacity.
Electrolyte level too low.
Charging rate too low in aircraft.
Too little usage or shallow discharges.
Complete failure of battery to operate.
a. Loose or broken lead.
b. Loose or disengaged terminals in battery.
c. Battery not charged.