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For models with serial numbers above 10,000 when
the ignition switch is in the run position and with the
steering switch in the neutral (engaged), position
power is supplied to terminal 86 of the start relay and to
terminal 30 of the PTO relay. Engaging the seat switch
starts the hour meter and energizes the start relay. The
start relay when energized provides a ground to the
PTO relay. Now engaging the PTO switch will engage
the PTO clutch.
STEP 4
With ignition switch in the start position, battery voltage
is transferred from terminal B to S. Terminal S transfers
battery voltage through the PTO switch (disengaged)
the neutral switch (engaged) and to the starter solenoid
relay which powers the starter solenoid.
PTO clutch check out: Remove the wiring harness PTO
clutch leads from the clutch. With a multimeter check
the clutch coil for resistance to see if the coil is good.
The clutch used should have a coil resistance
according to the table below. If the coil is bad there will
be no resistance or it will be higher.
Ignition switch check out: Battery voltage check in the
"off" position, check for voltage at terminal B. It should
not be present on terminals A, S, L.
With the ignition switch in the "run/light" position, check
for battery voltage at terminal B, A, L, Y. It should not
be present at terminal S.
With the ignition switch in the "run" position, check for
battery voltage at terminals B and L.
With the ignition switch in the "start" position, check for
battery voltage at terminals B, L, S.
PTO switch check out: The PTO switch is a push/pull
switch with normal open and closed contacts. Power
transfer should be checked with a voltmeter. The
switch contacts should be checked with an ohm meter
with the wire harness plug removed. The light switch is
similar to the PTO switch with only one set of contacts.
Diode check out: Diodes are checked with an ohm
meter set on the diode check, and should only pass
voltage in one direction. If it passes voltage in both
directions or not at all the diode is bad and needs to be
replaced.
Contact resistance is 0.1-0.3 ohms when correct.
Normally open contacts manually activated. contact
resistance is 0.1-0.3 ohms when correct.
Part Number Ohms (± 5%)
00191700 2.84
03643100 3.68
04915400 2.45
Measurements For Models With Serial Numbers Above 10,000
Key Switch Off Run Start
B 11.50-13.00 Volts 11.50-13.00 Volts 11.50-13.00 Volts
A 11.50-13.00 Volts 11.50-13.00 Volts
S 11.50-13.00 Volts
L 11.50-13.00 Volts 11.50-13.00 Volts
Seat Switch Off Run Start
Red/Yellow Connected to Ground through test switch
Black Connected to Ground