Starting
Placing
the
Start/Run/Stop switch in
the
Start posi-
tion connects battery
ground
(B-)
to
the
K4
start re-
lay. This energizes K4,
which
closes
the
normally
open (N.
0.)
contacts
that
connect
battery positive
(B+)
to
the
following:
• N.C. contacts
of
K2
generator
relay
• Generator voltage regulator
• Ignition coil {T1)
• Fuel
pump
relay (K6)
• Start solenoid
(K1
)
Connecting
B+
produces
the
following control re-
sponses:
• Flashes
the
field,
to
make
sure
that
there
is
adequate
residual
magnetism
to
induce volt-
age
buildup.
• Energizes
the
ignition coil
{T1
),
so
it
can
begin
producing a
spark
when
ignition
module
S3
is
activated.
• Energizes
the
fuel
pump
relay (K6),
which
con-
nects
B+
to
the fuel
pump
and
fuel solenoid.
• Energizes
the
start solenoid
(K1
),
which
closes
its N.O. contacts
in
the
starter
motor
circuit.
• Energizes
the
solenoid fuel valve (E4), allow-
ing fuel
to
the
carburetor.
• Energizes
the
fuel
pump
{E3},
which
begins
pumping fuel to
the
carburetor.
• Energizes the
stop
latch relay (K5)
to
open
its
contacts
to
ground,
which
allows
run relay
K3
to
be
energized
through
closure
of
oil pressure
switch
S2
after
engine
startup.
Closing the
K1
start solenoid
contacts
connects
B+
to
the
starter motor.
This
energizes
the
starter
mo-
tor, which
begins
to
crank
the
engine
to
initiate
starting.
Starter
lockout-Run
When
the
engine
starts,
the
low
oil pressure switch
(82)
closes
to
connect battery
ground
to
the
run re-
lay (K3).
As
the
engine
comes
up
to
speed,
AC
out-
put
voltage
from
the
generator
energizes
the
gen-
erator relay
(1<2).
This
AC
voltage activates
the
choke
heater
element
through a separate
connec-
tion,
opening
the
choke and powering
the
fuel
pump
and
fuel solenoid.
Energizing
K2
opens
a set
of
contacts
to
de-ener-
gize K4,
and
closes
another
set
of
contacts
to
con-
nect
B+
to
the
generator
start disconnect/run relay
(K3). Energizing
K3
closes
a set
of
contacts
which
provides
an
alternate
B+
circuit
to
T1
ignition coil
and
S3
ignition module.
De-energizing
K4
opens
contacts
which
de-ener-
gize
K1
start solenoid
and
K6
fuel
pump
relay. De-
energizing
K1
disconnects
B+
from the starter
mo-
tor,
which
stops cranking. De-energizing
K6
closes
contacts
which
connect
E3 and
E4
directly
to
gen-
erator
power, rectified by CR1 0.
Opening
these
K4
contacts
at
this
time
has
no ef-
fect
on
engine
operation, because
they
are
in paral-
lel
with
the
closed
K3
contacts
which
connect
B+
to
the
ignition coil.
When
start-stop switch
S1
is
released
and
returns
to
center
(run) position,
the
engine
continues
to
run.
Relays
K2
(generator relay), K3 (run relay},
and
K5
(stop latch relay)
are
energized
while
relays
K1
(start solenoid),
K4
(start relay)
and
K6 (fuel
pump
relay)
are
de-energized.
Stopping
Moving start-stop switch
S1
to
the
STOP
position
grounds
resistors
R1
and
R2
to
de-energize
run re-
lay K3.
This
opens
its contacts
to
disconnect
B+
from ignition coil T1, and stop latch relay K5. De-
energizing
K5
allows its N.C. contacts
to
close
to
ground.
This
prevents K3 from being energized,
and
prevents
the
set
from restarting
when
switch
S1
is
released from
the
STOP
position.
Without
ignition,
the
engine stops.
As
the
generator
output
voltage drops,
generator
relay
K2
also
deenergizes. All
components
return
to
their
de-en-
ergized
position following set shutdown.
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