Service manual
CONTROL
PANEL
TROUBLESHOOTING
MANUAL
STARTER
DISCONNECT
(TOGGLE
SWITCHES)
NOTE:
The
engine control system
is
protected by a 20 amp manual reset circuit breaker
located
on
the
engine
as
close as possible
to
the
power
source.
Problem
Probable
Cause
Verification/Remedy
PREHEAT
depressed,
no
panel
indications
1.
Oil
Pressure
switch.
1.
Check
switches
and/or
battery
connections.
electric
fuel
pump
and
preheat
solenoid
not
energized.
2.
20
amp
circuit
breaker
tripped.
2.
Reset
breaker.
If
it
opens
again,
check
preheat
solenoid
cir-
cuit
and
run
circuit
for
shorts
to
ground.
START
SWITCH
DEPRESSED,
no
starter
1.
Connection
to
solenoid
faulty.
1.
Check
connection.
engagement.
2.
Low
DC
voltage
to
solenoid
terminal.
2.
Check
voltage.
Jump
voltage
to
S
terminal.
3.
Faulty
switch.
3.
Check
switch
with
ohmmeter.
4.
Faulty
solenoid.
4.
Check
that
12
volts
are
present
at
the
solenoid
connection.
5.
Loose
battery
connections.
5.
Check
battery
connections.
6
Low
battery.
6.
Check
battery
charge
state.
NO
IGNITION,
cranks,
does
not
start.
1.
Faulty
fueling
system.
1.
Check
for
fuel.
2.
Check
for
air
in
the
fuel
system.
2.
Allow
system
to
bleed.
3.
Faulty
fuel
lift
pump.
3.
Replace
fuel
lift
pump.
4.
Faulty
fuel
solenoid.
4.
Check
fuel
solenoid.
NOT
CHARGING
BATTERY
1.
Faulty
alternator
drive.
1.
Check
the
drive
belt
and
its
tension.
Be
sure
the
alternator
turns
freely.
Check
for
loose
connections.
Check
the
output
with
a
voltmeter.
Ensure
12V
are
present
at
the
regulator
terminal.(Exc.
Terminal.)
BATTERY
RUNS
DOWN
1.
Oil
pressure
switch.
1.
Observe
if
the
gauges
and
panel
lights
are
activated
when
the
engine
is
not
running.
Test
the
oil
pressure
switch.
2.
High
resistance
leak
to
ground.
2.
Check
the
wiring.
Insert
sensitive
(0-.25
amp)
meter
in
battery
lines
(Do
NOT
start
engine).
Remove
connections
and
replace
after
short
is
located.
TROUBLESHOOTING
WATER
TEMPERATURE
AND
OIL
PRESSURE
GAUGES
If
the gauge reading is other than what is normally indicated
by the gauge when the instrument panel is energized, the first
step is to check for 12 volts
DC
between the ignition (B+)
and the Negative (B-) terminals
of
the gauge.
Assuming that there is 12 volts as required, leave the
instrument panel energized and perform the following steps:
1.
Disconnect the sender wire at the gauge and see
if
the
gauge reads zero, which is the normal reading for this
situation.
2. Connect the sender terminal at the gauge to ground and
see
if
the gauge reads full scale, which is the normal
reading for this situation.
If
both
of
the above gauge tests are positive, the gauge is
undoubtedly
OK
and the problem lies either with the
conductor from the sender to the gauge
or
with the sender.
If
either
of
the above gauge tests are negative, the gauge is
probably defective and should
be
replaced.
Assuming the gauge is
OK, check the conductor from the
sender to the sender terminal at the gauge for continuity.
Check that the engine block is connected
to
the ground.
Some starters have isolated ground terminals and
if
the bat-
tery is connected to the starter (both plus and minus termi-
nals), the ground side will not necessarily be connected to the
block.
Engines & Generators
61