Westerbeke WPDS-20 Technical Manual page 59

Q.4
Marine Engine Electrical System
ACTIVATION BY LUBE OIL PRESSURE
(Keyswitch Start)
This system is supplied on all 4 and 6
cylinder Westerbeke diesels produced prior
to January 1975. Operation is very simple.
Putting the start switch in the Run posi-
tion energizes an alarm system (when sup-
plied). Returning the start switch to Off
position de-energizes the alarm.
Turning the start switch to Crank posi-
tion operates the starting motor and starts
the engine. Upon starting, the start
switch is released to the Run position.
When the engine develops oil pressure,
voltage is supplied to the alternator for
excitation and to all instruments. When-
ever the engine stops, loss of oil pres-
sure removes voltage from these devices.
When an engine is furnished with a pre-
heating device, it is energized by a sep-
arate push button at the key switch panel.
When an engine is furnished with an
electric stop solenoid,
it
is energized by
a separate push button at the key switch
panel.
NOTE: It is important that your engine in-
stallation includes fuses or circuit
breakers, as described under "Owner's Res-
ponsibility" on the wiring diagram supplied
with your engine.