31
Yes
Yes
Yes
No
Steering levers
out and PTO
switch 'OFF'.
Voltage tests
are performed
with a voltmeter
or test light to
battery ground.
Key switch is in
'RUN' position for
each test.
Does voltage
appear from
white wire on
positive terminal
of ignition coil to
ground?
Does voltage
appear from
terminal 'G' of
ignition fuse to
ground?
Does voltage
appear from
terminal 'A' of
main fuse to
ground?
Does voltage
appear from
'B' (battery)
terminal of key
switch to ground?
Test battery.
Replace ignition
coil.
Replace ignition
fuse.
Does voltage
appear from
terminal B of
main fuse to
ground?
Replace main
fuse.
Replace key
switch.
Does yellow wire
in terminal 85 of
control relay A
show ground?
Check yellow
wire to pad R or
diode from pad
A to pad R.
Replace control
relay A.
No
No
No
Yes
No
Yes
No
Yes
MODEL 720
(Onan engine)
NOTES:
1. All tests are made with wires in
place on their respective
switches.
2. Refer to fuse block diagram for
terminal locations.
3. Refer to 'Troubleshooting
Control Relays' for information
on the diode and control relays.
4. If engine will crank, control relay
B cannot be the problem. This
means that the PTO switch,
right steering switch, and left
steering switch cannot be a
source of the problem.
ENGINE WILL CRANK, BUT NOT START
Figure 27Figure 26Figure 25Figure 24
87
86 85
30
L
GB
S
M
PTO
7.5
7.5
REG.
30
15
MAIN
30
IGN.
START
A
D
E
G
F
J
B
C
I
H
A
R
P
I
M
Y
T
S
L
G
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