Engine Does Not Crank
Problem Possible Causes or Solution
Battery Voltage Below 12 Volts Follow Charging System Troubleshooting Guide
Parking Brake Not Set
Certain machines require the Parking Brake to be set before starting, check linkages and
switch.
The controls must be in the neutral position before starting
Inspect neutral interlock linka
es and ensure that switch is bein
completel
depressed
Check switch continuity; should be continuous when engaged (depressed)
Check Fuse on Purple Circuit
Check for a blown fuse. If fuse is blown, check for short circuit and replace with 20A
Fuse. Never use a circuit breaker style fuse.
Bad Elecrical Connection in Circuit
Disconnect, clean and reconnect electrical connections and ensure a good connection is
made with all wires. Check for loose wires and connectors.
Engine Cranks: Does Not Start
Problem Possible Causes or Solution
Check fuel valve position
Check for Varnished Gas and replace with fresh gasoline if needed
Parking Brake Not Set
Certain machines require the Parking Brake to be set before starting, check linkages and
switch.
The controls must be in the neutral position before starting
Inspect neutral interlock linka
es and ensure that switch is bein
completel
depressed
Check switch continuity; should be continuous when engaged (depressed)
Bad Elecrical Connection in Circuit
Disconnect, clean and reconnect electrical connections and ensure a good connection is
made with all wires. Check for loose wires and connectors.
Mower Starts: Does Not Charge
Measure/Test: Possible Causes or Solution
Check Battery Voltage Battery Voltage should be greater than 12 Volts, may need replacing if low voltage or old
Fuse on Yellow Circuit
Check for a blown fuse. If fuse is blown, check for short circuit and replace with 20A
Fuse. Never use a circuit breaker style fuse.
Yellow Wire Connector on Key Switch Inspect Yellow wire connection on Key Switch for good contact
Check Key Switch Key Switch Connectors A and B should have continuity in the "RUN" position
Bad Elecrical Connection in Circuit
Disconnect, clean and reconnect electrical connections and ensure a good connection is
made with all wires. Check for loose wires and connectors.
Check Stator Voltage from Engine while running Engine voltage from Stator should be greater than 12 Volts when engine is at full throttle.
Clutch Circuit Problems
Problem Possible Causes or Solution
Check Operator Presence Control (OPC) Switch; Black and Gray switches cannot be
interchanged, use approved Wright products
Disconnect, clean and reconnect electrical connections and ensure a good connection is
made with all wires. Check for loose wires and connectors.
Blades Start to Spin as Engine Shuts Off
Check PTO Relay: 30 & 87a should be normally closed, 30 & 87 should contact when
12V is placed across 85 & 86
Check PTO Connector and Main connector for good connection. Measure Voltage
across wire harness clutch connector, Voltage should be between 12-14.4 Volts. If
Voltage is not present when switch is engaged; check 12V supply circuit and Ground
Circuit.
Inspect wires leading into clutch housing for good contact and wire
Incorrect Coil Resistance. Use the following to bench test clutch circuit:
For Model CMS-150: Resistance=2.47 Ohms, Current=4.85 Amps.
For Model CMS-175: Resistance=2.30 Ohms, Current=4.86 Amps.
For Model CMS-200: Resistance=1.84 Ohms, Current=6.53 Amps.
Controls Not in Neutral
Electrical Troubleshooting
PTO Does Not Engage-Engine Remains Running
Controls Not in Neutral
Engine Dies when PTO activated-Blades do not start
to spin
Gasoline
46
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