OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-38 Published 10-01-12, Control # 044-05 v2
VOLTMETER OPERATION
Engine not running or
running at low idle.
Engine running fast enough to
make alternator produce.
➀
Dead or disconnected battery. Disconnected or
badly connected meter.
➀
Disconnected meter. Engine could not run with
dead or disconnected battery unless circuit was
completed around battery.
➁
Very low battery charge. Engine might not start.
➁ ➂
When pointer stays below 13.3V with engine
running fast enough to operate alternator, it
shows that alternator is not operating, voltage
regulator is out of adjustment, or current being
drawn from battery by lights, heater, fan, or
other load exceeds alternator output.
➂
Low battery charge. Constant reading in this
area indicates need to check alternator and
voltage regulator.
➃
Well-charged battery. Indicates a good battery
and that alternator and voltage regulator are
operating properly.
➃ ➄
When engine is started, pointer might stay in
this area temporarily, but it should gradually
rise above 13.3V as alternator reaches normal
output.
➄
Pointer might remain in this position temporarily
when engine has been stopped after
considerable use, due to a “surface charge” in
battery. To get a correct reading, turn on wipers
or heater for a few minutes.
➅ ➆
Under normal conditions, a 12V battery is fully
charged at 12.8V. A slightly higher reading
might occur under conditions outline in No. 5;
generally speaking, however, any reading
above 12.8V when engine is stopped is not a
true reading.
➅
This is area where pointer should be when
alternator, voltage regulator, and battery are all
in good condition and working properly.
➆
When pointer goes above 15.2V, voltage
regulator is set too high or jammed; continued
operation of engine will burn out battery.
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