RZT-S
66
Start Circuit
Turning the key to the START position:
• spins the starter motor
• enables the ignition
• energizes the afterfire solenoid
The circuit that sends power to the starter motor:
See Figure 7.8.
1. When the key switch is in the START position, bat-
tery power is passed from the “B” terminal to the “S”
terminal.
2. Power goes from the key switch S terminal to the
brake switch NO contacts. (orange wire)
2a. If the brakes are off, the switch plunger will be
up and the NO contacts will be open. The sys-
tem monitor will measure open circuit voltage,
illuminating the brake symbol.
2b. If the brakes are applied, the switch plunger will
be depressed, and the NO contacts will be
closed. Power will be passed along to the PTO
switch.
3. When the key is in START, and the brakes are
applied, power will continue to the A-NC terminal of
the PTO switch (orange/black trace).
3a. If the PTO switch is on, the NC terminal on the
“A” set of contacts will not connect to anything. The system monitor will measure open circuit voltage,
illuminating the PTO symbol.
3b. If the PTO switch is off, the NC terminal on the “A” set of contacts will be connected to the COM terminal
on the “C” set of contacts. Power will be passed along to the trigger terminal on the starter solenoid.
4. When the following conditions are met:
• Key to START
• park brake set
•PTO off
The starter solenoid trigger terminal will receive power (orange wire).
5. When the starter solenoid is energized, it internally connects the heavy red cable from the battery with the
heavy red cable that leads to the starter motor, and the starter spins.
+EY3WITCH
3TARTER3OLENOID
"ATTERY
.%'
0/3
&USE
'RND
'ROUND
04/3WITCHh/FFv
#/-
./
.#
3YSTEM
-ONITOR
!
"
#
3TARTER-OTOR
'ROUND
.#
./
"RAKE3WITCH
$EPRESSED
3
-
"
,
'
Figure 7.8
www.mymowerparts.com
For Discount Cub Cadet Parts Call 606-678-9623 or 606-561-4983
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