Be sure you are sitting on the mower with the clutch pedal pushed down,blade engagement in off position,
there may be a safety switch bad or a wire pulled off of one or more of them or a bad starter solenoid which is a high failure item.
Check safety seat switch wires under seat,look under mower for clutch pedal switch wires located under mower near clutch pedal, check the blade safety switch if its a manual blade engagement? The (starter solenoid) you will need to find the red wire on your battery and follow it until you find it or from the starters red wire back towards battery.
Once you find it inspect the solenoid to be sure wires are in tact,then find a dc volt meter and check to see if you have voltage(12volts dc min.) to the small red wire hooked to the solenoids coil (near the bottom) when the the ignition key is turned to start position(one of your meters wire to the coil wire and one to a good ground,,if your meter goes backwards reverse the meter leads)Note:lock the clutch pedal down before you do this) If you have voltage to this wire when key is turned to start position? solenoid is most likely bad or if you dont have voltage trace that wire backwards until you find voltage then you may have found your culprit.
Really,check those safety switches,There are four of them in the wiring harness,to make a complete circuit. Anyone of them could be dirty,corroded or a broken wire at the switch. These switches are exposed to the elements. They have no real protection around them. They get wet from time to time and corrode.These switches are wired in a series,and like cheap christmas lights,one bulb burns out the whole string is out,you have to go through the whole string to find the bad bulb. Same here,one switch is bad,the whole wiring harness is out,you will have to back track,each switch until you find the defected one. Your best bet is to,use a jumper wire at each switch,until you find the bad one. I use a 12v test light at the switch,this requires disconnecting the wiring and checking the female connections for power,if 12v is found,then the next step is to use a multimeter to check the switch for ohms and continuity to be sure that switch is okay. You will have to activate the plunger to make this test,if the switch is okay. Most switches are hard to get at like the brake/clutch safety switch,seat safety switch,reversing switch and the mower engaging switch,without disassembling some part of the tractor,to get at the switch. I like to use a jumper wire,to bypass the switch,then go to the next switch in line,do the same to all the switches,until you find the bad switch or a break in the wire. If it a bad switch,then the real hard works begins,when you have to remove/check the switch. A real time consuming procedure.Hope this info.,helps.Sincerely,Brad Locke
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