Textron JACOBSEN R-311 69166, Technical/Repair Manual

Page: 106 / 402

ELECTRICAL
4203781 First Edition 4-55
4
Low Charge Pressure Light
When the low charge pressure switch is closed, a ground
is provided to the low charge light, turning on the light.
Ground is also provided from the low charge pressure
switch through diode (V9) to horn relay terminal 85,
energizing the relay. With the relay energized, voltage is
provided from horn relay terminal 87 to the horn, turning
on the horn.
Engine Coolant Temp Light
When the engine coolant temp switch is closed, a ground
is provided to the engine coolant temp light, turning on
the light.
Ground is also provided from the hyd temp switch
through diode (V2) to horn relay terminal 85, energizing
the relay. With the relay energized, voltage is provided
from horn relay terminal 87 to the horn, turning on the
horn.
Engine Oil Pressure Light
When the engine oil pressure is below 7 psi (0.483 bar),
the engine oil pressure switch contacts close. With the
switch contacts closed, a ground is provided to the
engine oil pressure light, turning on the light.