
DC
ELECTRICAL
SYSTEM
DESCRIPTION
The
DC
Circuit on the 4.0 KW BCD functions to start,
operate and stop the generator engine. The circuit is best
understood by reviewing the
DC
WIRING SCHEMATICS.
The
engine's
DC
wiring is designed with three simple basic
circuits: preheat, start, and stop. .
Engine
12-Volt
DC
Control
Circuit
The
engine has a 12 volt
DC
electrical control circuit that is
shown on the wiring diagrams that follow. Refer
to
these dia-
grams when troubleshooting
or
when servicing the
DC
elec-
trical system on the engine.
A
CAUTION:
To
avoid
damage
to
the
battery
charging
circuit,
never
shut
off
the
engine
battery
switch
while
the
engine
is
running.
Shut
off
the
engine
battery
switch,
however,
to
avoid
electrical
shorts
when
working
on
the
engine's
electrical
circuit.
Battery
Specification
The minimum recommended capacity
of
the battery used in
the engine's 12-volt
DC
control circuit is 300-600 Cold
Cranking Amps (CCA).
Battery
Care
Review the manufacturer's recommendations and then estab-
lish a systematic maintenance schedule for your engine's
starting batteries and house batteries.
o Monitor your voltmeter for proper charging during engine
operation.
o Check the electrolyte level and specific gravity with a
hydrometer.
o Use only distilled water to bring electrolytes to a proper
level.
o Make certain that battery cable connections are clean and
tight to the battery posts (and to your engine).
o Keep your batteries clean and free
of
corrosion
..
A
WARNING:
Sulfuric
acid
in
lead
~tteries
can
cause
severe
burns
on
skin
and
damage
clothing.
Wear
protective
gear.
GLOW
PLUGS
The glow plug is a small heater installed in each pre-combus-
tion chamber. They run off the engine starting battery and
become red hot when activated.
The glow plugs are wired through the preheat solenoid.
When
PREHEAT
is
pressed at the control panel this solenoid
should
"click" on and the glow plug should begin to get hot.
Glow plugs can be checked by unscrewing and holding them
against a good ground (engine block) and turning them on.
The tip should glow red hot.
You
can also use
an
ammeter to
test the power drain (8 to 9 amps per plug),
or
an
ohmmeter
to
test resistance (1.1 to 1.2 ohms).
A
WARNING:
These
glow
plugs
will
become
very
hot
.
to
the
touch.
Be
careful
not
to
burn
your
fingers
when
testing
plugs.
Re-install the plugs
in
the engine and test them again. The
plugs should get very hot (at the terminal end) with
20
to
25
seconds.
If
the plugs don't heat
up
quickly, check for a short
circuit. When reinstalling the glowplugs, use anti-seize com-
pound on the threads.
A
CAUTION:
Do
not
keep
glow
plug
on
for
more
than
30
seconds.
GLOW
PLUGS
Engines
&
Generators
20
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