ELECTRICAL
SYSTEM
I
~
Warn
ing
lamp
Key sw
itc
h
Fuse
l-
~
Battery
011
pressure
se
nder
SWITCHES
The instrument panel is equipped with two switches: a
key switch and a start switch. A lighting switch is also
used on instrument panels equipped with a tachometer.
Most engines are also equipped with a
battery cut
off
switch. Referto the following sections to check the opera-
tion
of
these switches. Also refer to the wiring diagrams at
the back
of
this manual.
Key Switch
The key switch is mounted on the instrument panel.
When the key is in the ON position, the switch directs cur-
rent to the circuits it controls.
Perform
voltage or resistance checks to determine
if
the
switch is operating properly.
195
Sta
rt
Switch
The start switch mounted on the instrument panel is a
push-button switch that closes the starter motor circuit
when
the button is depressed.
Perform voltage or resistance checks to determine if the
switch is
operating properly.
...---,
9
B
attery
Cut
off
Switch
The battery
cutoff
switc h is con nected between the pos-
itive terminal
of
the battery and the starter solenoid. The
switch provides a
means to
cutoff
all circuits from the bat-
tery in case of fire or othe r electrical
eme
rgencies. Using
the
cutoff
switch also prevents any electrical drain on the
battery.
To test the switch, check for voltage at the starter sole-
noid terminal, or disconnect the positive battery cable and
check
the switch using an ohmmeter.
SEND
ERS
The engine is equipped with senders that trigger warn-
ing lights and the alarm buzzer
if
engine oil pressure or
water temperature reaches a dangerous level. The senders
are essentially switches that complete an electrical circuit.
Oil
Pr
essur
e Se
nder
Refer to the oil pressure circuit in
Figur
e 22. The
sender is closed at zero oil pressure, which allows current
to light the warning lamp and sound the alarm buzzer
when
the key switch is on. When oil pressure rises above
9.8-29A kl'a (I A-4.3 psi), the sender opens, the warning
lamp goes out
and
the alarm buzzer quits.
The
oil pressure sender on
10M
and I
OMl
Ois located
on the oil filter adapter as shown in
Figure
23. The oil
To Next Page
Loading...
Need help?
General
