Understanding The Pto Switch - Cub Cadet 1000 SERIES Service Manual

38.18. The red wire on the OCR plug carries battery
voltage.
• Behavior: D.C. battery voltage should show-up
on a volt meter when the red probe is touched to
this terminal and the black probe is grounded,
regardless of the key switch position.
• Circuitry: This wire draws power directly from
the B terminal on the key switch.
• Interpretation: If there is not battery voltage at
this terminal, the tractor is probably not function
at all. Look for a blown fuse, disconnected bat-
tery, disconnected ammeter or some other major
fault.
38.19. The purple wire provides a ground signal to the
RMC module when the key switch is placed in
the REVERSE CAUTION MODE.
• Behavior: There should be continuity to ground
at this terminal when the key switch is in the
REVERSE CAUTION MODE position.
• Circuitry: When the key switch is in the
REVERSE CAUTION MODE position, a ground
path is established by connecting terminal A2 to
terminal L within the key switch. The white wire
from the RMC module connects to A2, and a
green ground wire connects to L.
• Interpretation: If the purple wire fails to reach a
ground path when the key switch is in the
REVERSE CAUTION MODE position, the RMC
module will not arm or operate. Check the key
switch for continuity between A2 and L in the
REVERSE CAUTION MODE position, confirm
that the green wire connecting to the L terminal
does have good continuity to ground, and check
for any loss of continuity in the purple wire that
extends from the key switch to the RMC module,
including the molded connector between the two
components.
• If the RMC plug test indicates fault with any of
the safety switches, the next step is to test the
suspect switch.The operation of those switches
is described in the following sections.
39.

UNDERSTANDING THE PTO SWITCH

39.1. A-COM is in the starter inhibit circuit. It is a nor-
mally closed (NC) set of contacts. When the
PTO is OFF, and the contacts are closed, power
coming from the brake switch (key switch in
START, brakes ON) through the orange wire
with black trace is passed on to the trigger termi-
nal on the starter solenoid through the orange
wire with white trace.
39.2. B-COM is in the safety shut-down circuit. It is a
normally opened (NO) set of contacts. A circuit is
completed from the M terminal on the key switch
through the yellow wire to the Magneto terminal
on the RMC module through the yellow wire with
black trace when the contacts are closed. This
gives the RMC module the ability to turn-off the
engine when the PTO is ON.
39.3. In C-Com, power is supplied to the PTO switch
from the A1 terminal of the ignition switch
through a red wire.when the PTO switch is
turned on this completes the circuit to allow
power to go to the PTO clutch. It is a normally
opened (NO) set of contacts.
NOTE: The top terminals are showing normally
closed at rest and the middle terminals are nor-
mally open at rest
NOTE: There are three contacts on the right side
in the C-COM.For this application the normally
opened (NO) contact is used.
77
Series 1000 and 1500
Figure 39.3