You're saying that it will start if you use a booster battery (jump start)? If it starts and runs but then needs a jump again next time you want to use it, then you have either a bad battery or a bad charging system.
Normally seat switch provides nothing but an ignition kill circuit.
Depending if you have a solenoid the has 2 small wires or 1 It can be loss of ground. Basically is there voltage at solenoid trigger connection? if so is there voltage at the start terminal on ignition switch? If not is there voltage at battery terminal of the ignition switch? If not you probably have a blown fuse.
SOURCE: 1987 john deere 750 compact tractor 4 wheel drive, wont start
percussive maintenance my friend. Try banging on the solenoid and starter with a hammer while in the start position. Also, if you have a voltmeter, you can see where voltage is getting to and that will help you as well.
SOURCE: John Deere Sabre 14.5/38 HYDR lawn tractorWont't
See if there is a plastic connector on the wires leading to the seat switch. If there is try disconnecting it and use a piece of wire (with insulation on it) to use a jumper. There is probably two wires coming from the tractor to the seat. After disconnecting Place one end of wire into the wire connector coming tractor and the other end of wire in the same connector on the other side. That will act like the seat switch is closed like you are setting on it. Try and start. Had the same problem on an electric hyster at work and that was the fix we used because the switch is pretty expensive and a hassle to change.
Hope this helps
roundo4
SOURCE: John Deere L120. When the mower clutch is engaged
Try a new seat switch,or the rio switch on the right rear of the trans-axle.
SOURCE: problem with John Deere L120 tractor
Park brake switch is the most likely culprit,any other would cause the tractor to not turn over in the crank position.
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ok,think i found it,it is a sensor by your ign switch,it is a battery discharge sensor,it is number 14 on this diagram,part number AM125252 Sensor | BATTERY DISCHARGE,i will also give you links to see more.
http://www.circletractor.com/OemParts?_B...
http://www.searspartsdirect.com/sabre-jo...
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