White Outdoor LT-5 Service Manual page 40

700 SERIES LAWN TRACTORS
17.17. Yellow wire with black trace from the 8-pin pigtail
connector provides input to the module from the
PTO switch: See Figure 17.17.
PTO safety switch to RMC module
Figure 17.17
• Behavior: When the female (metal) pin terminal
leading into the main harness is probed, there
should be continuity to ground only when the
PTO is ON, regardless of whether the brake is
applied or the seat is occupied.
• Circuitry: The yellow wire with black trace
leads to the PTO switch, where it finds a path to
ground when the PTO is ON.
• Interpretation: If behavior is correct, the N.C.
side of the PTO switch /circuit is functioning
properly.
If there is continuity to ground when the PTO is
OFF, the switch may be inoperative or there may
be a short to ground in the wire leading to it.
If there is not continuity to ground when the PTO
switch is ON, the PTO switch may be inopera-
tive, or there may be an open condition in the
wire that leads to it.
17.18. Reconnecting the pigtail, and returning to the
RMC Plug: there is a blank space next to the yel-
low wire with black trace.
17.19. There is a red wire with black trace next to the
blank space in the RMC connector. This wire
provides the module with input from the reverse
switch.
• Behavior: When the tractor is in reverse, this
terminal should have continuity to ground.
• Circuitry: This wire runs directly to the reverse
safety switch under the right fender. This is a
simple metal tang switch that grounds-out
against the transmission control lever.
Probe here
36
• Interpretation: Continuity to ground when the
tractor is not in reverse would indicate a short to
ground in the circuit. This could take the form of
a chafed wire contacting ground, a bent reverse
safety switch that is always in contact with
another metal part, or a broken plastic insulator
that separates the switch from the fender.
Lack of continuity to ground would indicate a
broken or disconnected wire leading to the
reverse safety switch, or a switch that is not clos-
ing because of physical damage or corrosion.
17.20. At the opposite end of the top row from the yel-
low wire with black trace is a green wire.
• Behavior: The green wire should always have
continuity to ground.
• Circuitry: The green wire leads to ground.
• Interpretation: If this ground path is not good,
there will probably be other ground-related
issues with the tractor: slow starter motor, slow
battery charge, dim lights. All ground connec-
tions should be mechanically secure and corro-
sion free.
17.21. The red wire immediately below the Yellow wire
with black trace 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 func-
tional at all. Look for a blown fuse, disconnected
battery, disconnected ammeter or some other
major fault.
17.22. The yellow wire with white trace that is adjacent
to the red wire in the bottom row goes to the
parking brake switch that is riveted to the
inside of the left front edge of the dash panel.
• Behavior: There should be continuity to ground
from this terminal only when the parking brake
lever is in the ON position.
• Circuitry: The yellow and white wire leads
directly to the parking brake switch. When the
parking brake is ON, the plunger on the switch is
down, closing the contacts. When the contacts
close, a circuit is completed to the green ground
wire.