Cub Cadet 2000 Series - Manual (Page 104)

2000 Series Tractors
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Red wire with black trace
• Behavior: There is a red wire with black trace between yellow wire with a black trace and the green wire. This
wire provides the module with input from the reverse switch. When the mower is in reverse, this terminal
should have continuity to ground.
• Circuitry: This wire runs directly to the reverse safety switch. This is a simple metal tang switch that grounds-
out against the hydro control rod.
• Interpretation: Continuity to ground when the mower is not in reverse would indicate a short to ground. 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 drive pedal shaft.
Lack of continuity to ground would indicate a broken or disconnected wire leading to the reverse safety switch,
or a switch that is not closing because of physical damage or corrosion.
Green wire
• Behavior: At the opposite end of the top row from the yellow wire with black trace is a green wire. 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
mower: slow starter motor, slow battery charge, dim lights. All ground connections should be mechanically
secure and corrosion free.
Red wire
• Behavior: The red wire on the OCR plug carries battery voltage. It should show D.C. battery voltage when the
key switch is in any of the run positions.
• Circuitry: This wire draws power directly from the A1 terminal on the key switch.
• Interpretation: If there is no battery voltage at this terminal, the mower is probably not functioning at all. Look
for a blown fuse, disconnected battery or some other major fault.
Purple wire
• Behavior: There should be continuity to ground at this terminal when the key switch is in the REVERSE CAU-
TION 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 purple 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 CAU-
TION 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.
4. 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.