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C-161 TWIN
IGNITION SYSTEM
The C-161 Twin uses magneto ignition. A
relay is used to ground the magneto, which
stops the engine. The ignition switch is used
to supply voltage to the relay, and engage the
starter solenoid.
The ignition switch continuity test is per-
formed as follows with the switch totally dis-
connected:
Position
OFF
RUN
START
Terminals
no continuity
B&'R&'I&.A
B&'S&'I
Continuity between these terminals in the
positions shown indicates a good switch.
Do not interchange C and D-Series ignition
switch with B-Series even though they
look identical.
CHARGING SYSTEM
The C-161 Twin is equipped with a dual
circuit alternator. One circuit provides 12 volts
AC (alternating current) to power the lights.
The lights will NOT operate without the engine
running.
The second circuit provides charging current
(12 volts DC) to the battery.
Never interconnect the AC light circuit and
the DC battery circuit as charging system
may be seriously damaged.
The alternator charging system requires no
service other than periodically checking that
all exposed wiring and electrical connections
on the tractor are clean, tight, and in good con-
dition.
Disconnect the alternator wires plug when
charging the battery in the tractor or when us-
ing a booster battery to start the engine. The
alternator wires plug is located on top of the
engine.
Proper polarity is critical with an alter-
nator equipped charging system. Always
disconnect the battery ground cable (nega-
tive) before working on any part of the
electrical system. Verify all components
are connected correctly before reconnect-
ing the ground cable (negative) or dam-
age to alternator system components will
result.
Never run the engine if the battery is re-
moved, or if the battery is not connected
to the charging system. Serious damage
to
charging
system
components
may
result.
6-10
CHARGING SYSTEM TEST
The overall charging system is tested by
placing a DC voltmeter across the battery ter-
minals with the engine running at full throttle.
The reading should be at least 13.5 volts.
AMMETER TEST
To test ammeter, start the engine. Ammeter
should indicate discharge while the engine is
cranking. The ammeter reading will be around
zero at idle speed; a constant charge reading
will be indicated at full engine RPM.
INTERLOCK SWITCHES
Same as C-Series.
SEAT SWITCH
A seat switch is incorporated on C-Series
tractors. If the driver rises off his seat with
the PTa engaged, the seat switch interrupts the
relay coil voltage which grounds the magneto,
causing the engine to stop. The seat switch has
no effect on the tractor un less the PTa lever
is engaged.
The engine can be started without the seat
switch being depressed.
The seat switch is located under the seat in
the seat pan. See Fig. 6-10. To replace the
switch, remove the transaxle oil dip stick for
finger access to the switch. Remove the nut
from the top of the switch and pull the switch
from the seat pan.
LIGHTING CIRCUIT
The C-161 incorporates an alternator system
(12V A.C.) for lighting only. The lights work
only when the engine is running.
WIRING HARNESS
Harness routing for the C-161
Twin is
shown in Fig. 6-23. Refer to C-Series electrical
circuit diagram for connections when servicing
or replacing the entire harness. See Fig. 6-24.
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