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Garden Tractors Discussion Forum

JD 110 ignition switch

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Ron Bachus

01-15-2006 11:45:28




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My '68 110 starts and runs well, but the ignition switch does not stop the engine. I have to turn off the engine by pulling the spark plug lead. I have replaced the switch with a new one, but the same still happens. I went thru the electrical diagrams in the service manual, and everything appears to be wired correctly. I am not sure what the "mechanism" is for killing the engine, so I don't know where to look next. Any advise???

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Bob

01-15-2006 23:10:53




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-15-2006 11:45:28  
What's your serial number? Different ignition systems were used over the years. I suspect your's has magneto ignition, and there is a wire from the points/condensor to the ignition switch, probably with a connection or two in between.

The magneto makes it's own electricity for it's operation, and when the key is turned to "off", the ignition switch simply grounds out the mag, and "kills" the engine.

You may have the wrong switch for the S. N. of the tractor, or an open circuit between the condensor terminal and the "kill" terminal on the igntion switch.

Post the serial number of the tractor, and the part # of the ignition switch you are using.

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Ron Bachus

01-16-2006 16:48:52




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 Re: JD 110 ignition switch in reply to Bob, 01-15-2006 23:10:53  
The tractor SN is 103574M- I got a new switch from the local JD dealer, part #AM 30771, per the parts manual I have for the tractor. It is a 4-prong switch, identical to the one that was on the tractor when I bought it. Unfortunately, I have the same problem with the old and new ignition switches...The only connections I have not thoroughly inspected are those "behind" the fly wheel going to the stator assembly. The diagrams in the service manual are not detailed enough to distinguish the correct connections, but I have two wires leading to the stator from the main wire harness, and there are two coming out toward the front of the tractor, one is the spark plug wire, and the other leads directly to the breaker points. Another wire (from the same connection on the points) goes to the condenser. That is the only wire going to the condenser. It appears on the diagrams that there should only be one wire connection to the points, but as I said, it is hard to tell.

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Bob

01-17-2006 00:27:10




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-16-2006 16:48:52  
That switch number should be correct, there is a newer number, too, AM102543.

There will be 3 wires connecting the engine to the tractor chassis.

2 are AC wires from the alternator stator under the flywheel that pass through the engine harness connector, and on to the voltage regulator.

The other is the "kill" wire that goes to the ignition switch, and shorts out the mag when the key is shut off.

There will be one wire on the points, that leads to the condensor. On the condensor, there will be the lead fron the points, and the lead from the coil under the flywheel. That lead will be either double or tee'd off, so there is the other lead to the engine harness plug, where it mates to the tractor harness, and winds up at the "kill" terminal on the ignition switch.

Simply put, the primary ignition current to the points and coil gets shorted to ground when the key is turned to "off".

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Ron Bachus

01-17-2006 20:31:23




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 Re: JD 110 ignition switch in reply to Bob, 01-17-2006 00:27:10  
Thanx for your help Bob- Based upon your description, it appears as though someone attempted to rewire part of the system and messed up- I do have three wires at the connector leading to the engine (from the main wire harness), one goes to the switch and the other 2 go to the regulator- but on the engine side, there are only two wires on that connector, both of which go to the stator. So it appears one wire is missing. If I understand you correctly, the wire from the switch should splice together with the wire from the stator, and then go to the condenser. Also on the condenser will be a wire that goes to the points. So all I should really need to do is continue the wire lead from the switch, take it behind the flywheel, and splice it in with the existing wire from the stator to the points.

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Bob

01-17-2006 22:40:23




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-17-2006 20:31:23  
All you need to do is get the wire from the switch connected to the condensor, which is a common junction point of the switch wire, the wire from the points, and the wire from the magneto coil behind the flywheel that connects to the condensor.

The wire from the switch must NEVER send battery voltage into the mag ignition system. If someone has re-wired at the switch, or you would have had the wrong switch, and battery voltage got sent to the ignition system, likely the points AND the coil would get fried.

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Ron Bachus

01-18-2006 15:39:48




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 Re: JD 110 ignition switch in reply to Bob, 01-17-2006 22:40:23  
OK- Right now, a wire from the stator goes directly to the points, and another wire from the points goes to the condenser. I have to re-wire that so the wire from the stator goes first to the condenser, and another wire goes from the condenser to the points (so the points are essentially the 'end of the line'). In addition, I must extend the wire from the switch directly to the condenser, with no connections in-between. There will then be 3 wire connections at the condenser, and only one at the points. The two wires I have running "into" the stator, and the 2 running "out of" the stator will remain the same, except one coming out (not the spark plug lead) will go first to the condenser, not the points. This appears to be consistent with one of the drawings in the manual. Is this summary accurate? I just want to be sure so I don't fry anything. Thanx again.

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gab

01-16-2006 19:17:43




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-16-2006 16:48:52  
If you have a plug wire coming out behind the flywheel then you have a magneto and need a ground wire from the ignition switch when the key is turned off. Look around again, there should be another wire going to the points or mag. Jim



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gab

01-16-2006 19:17:01




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-16-2006 16:48:52  
If you have a plug wire coming out behind the flywheel then you have a magneto and need a ground wire from the ignition switch when the key is turned off. Look around again, there should be another wire going to the points or mag. Jim



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Ron Bachus

01-16-2006 19:58:57




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 Re: JD 110 ignition switch in reply to gab, 01-16-2006 19:17:01  
I am certain there are no other wires going to the points or mag- before replying, I again checked the service manual- the best diagram shows two wire connections at the condenser and one at the points- I have one at the condenser and two at the points- could this be responsible for not stopping the engine? If so, wouldn't there be problems elsewhere? Also, the ignition switch is only 4-prong, with no space for a 5th, "grounding" wire- wouldn't the fact that the switch is bolted to the dashboard act as a ground? Maybe I'm misunderstanding.

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sha nnon from ohio

01-15-2006 12:02:57




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-15-2006 11:45:28  
Trace all your wires from the switch and see if there isn't a short? The 110's use a battery ignition system so pulling the sparkplug wire DOES NOT shut off the coil as it is fed +12v from the switch and if left on WILL run down the battery if points are closed and possibly damage the coil or the points...



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Ron Bachus

01-15-2006 17:37:15




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 Re: JD 110 ignition switch in reply to sha nnon from ohio, 01-15-2006 12:02:57  
Thanx for the reply- I have thoroughly inspected the wiring and all was in good shape- no damage, no loose connections, no shorts. What else could be causing the problem? In the mean time, how should I "turn off" the engine without the key working?



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Timberoak 2119

01-16-2006 13:43:02




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-15-2006 17:37:15  
Where are you getting your switch? If not I would get the proper switch by model and serial number from a John Deere dealer. The reason I mention this that there are more than one five terminal switch available. The switches will fit and plug in but are NOT interchangeable. Do not use a switch from short line or auto parts store as they will look at your switch and say this will work. Just a thought, good luck, David

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Ron Bachus

01-16-2006 16:52:03




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 Re: JD 110 ignition switch in reply to Timberoak 2119, 01-16-2006 13:43:02  
I purchased the switch from the local JD dealer, citing the tractor SN and the parts manual I have for the tractor, so I hope its correct- they hit me for $20 on the switch alone...Thanx.



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ricedaddy

01-16-2006 19:29:19




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 Re: JD 110 ignition switch in reply to Ron Bachus, 01-16-2006 16:52:03  
find a small engine place that sells parts from "Rotary" out of Geargia, I will try to get you a number tomorrow!



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Ron Bachus

01-16-2006 20:00:24




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 Re: JD 110 ignition switch in reply to ricedaddy, 01-16-2006 19:29:19  
Thanks, I appreciate it.



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