
ELECTRiCAL
SYSTEM
Engirle 12-Voit DC
Control
Circllit
The engine that drives the end has a 12-Voll
DC
electrical conlrol circuit, as shown on the wiring
diagrams
which follow on pages 46 and 47. Reier
to
Ihese diagrams when troubleshooting
or
servicing
electrical components
on
lhe
engine.
To avoid
damage
to
Ihe
haI1A'V',
charging
while the engine
is
running.
H()w~)VE",
shut off the engine's battery switch
to
avoid electrical shorts when
working
on
lhe
engine's electrical circuit with
lhe
engine stopped.
never shut off the engine's battery switch
u nMP
An
overspeed shutdown switch shuts off the generator
set should the engine's speed reach approximately 2175
rpm. This shutdown
circuit consumes 25 milliamps (.25
or
1/4th of an Amp) at all times once the generator
is
con-
nected
to
its battery.
As
this only amounts
to
about
18
Amp-hours in
11
II
Is
unnecessary to be concerned
wilh this slight discharge during normal seasonal opera-
tion. If the generator set were
10
be
unattended for many
months, the two easiest ways
to
stop this slight drain
is
to
lirst
tum
011
the main switch 12 volts
to
the generator set. The second way
to
stop this slight drain
is
to
remove the fuse on the generator-mounted
control
ICNTTJ:ON
FUSE
Should the shutdown Irom an the circuit must be reset in order
to restart the II the switch ilself
is
faulty and it the
STOP
switch
will not reset
it,
lift the T -j coil connection Irom the switch and connect it with the
T-2
connection on the switch. NOT connectlhese wires
as
loose ends. Make sure that both the
T
-1
and
T-2
terminal wires are connected
to
the T -2
DO
NOT the with the over-
switch
the switch only for purposes. the overspeed
switch
to
maintain this
circuit's
intA<1,ritv
The minimum recommended of the
M,rr<>,v
used in the engine's 12-Volt DC control circuit
is
90
-
125 for the sets covered this manual.
When
qulck-,chaJgio1g
"",rrA'V
with
an
external
be
sure
to
disconnect the battery
LA,Bv.no the circuit connected while will
cabies from
the
hal1",v
rl'"n~r'''
the alternator's diodes.
Westerbeke Generators
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