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JD 3020 Gas
:

Electronic Ignition

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DHunter

12-19-2001 05:49:51




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I have installed an electronic ignition system on my JD 3020 gas tractor, S/N 134676R. It runs great but the manufacturer recommends that the ignition resistor be removed or bypassed. My tractor manual says the "ignition resistor is a resistance wire between the large connector above the rear of the engine and the starter". Can anyone give me a more specific description and suggest the best way to replace or wire-around it? Also, is there an advantage in eliminating the ignition resistance when using an electronic ignition system?

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DHunter

12-19-2001 08:38:07




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 Re: JD 3020 Gas - Electronic Ignition in reply to DHunter, 12-19-2001 05:49:51  
Thanks a bunch guys for the good and timely response.



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WTW

12-19-2001 08:11:42




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 Re: JD 3020 Gas - Electronic Ignition in reply to DHunter, 12-19-2001 05:49:51  
Clooney has got you the correct information and I will try and give you some additional information on how too replace the resistor the best I can. The resistor circuit / wire is between the ignition switch and the ignition coil. The bypass circuit is between the starter solenoid "S" terminal and the ignition coil. The only thing that needs to be removed from the original circuit as you stated is the resistor. The resistor is a single strand "special wire" that is in the ignition circuit between the switch and coil. The terminal at the coil will have both the bypass wire from the starter solenoid and the ignition resistor wire crimped in one common terminal, the light single strand wire at this terminal is one end of the resistor wire (may have a cloth like insulation on it). The other end depending on serial number will be either at the firewall connection or the ignition switch. Find it and replace it with a 16 gauge piece of wire. If your tractor has the rectangular firewall connector get a replacement terminal for it from a JD dealer to put on your new wire and run wire from the connector to coil taping it to the original harness. Hope I didn't confuse you more. You will see this wire if you look for it. Good Luck, Dave W.

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Clooney

12-19-2001 07:32:35




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 Re: JD 3020 Gas - Electronic Ignition in reply to DHunter, 12-19-2001 05:49:51  
DHunter, I can't help you on the exact placement of the resistor wire on the 3020 as I don't have a wire diagram of the 3020 gas. One of the advantages of using an electronic ignition is that the transistor switching circuit in the electronic ignition can handle higher current (amps) than a point system so higher primary current can be used. Because a point system can only handle a low current circuit the coil on a 12 volt point system is usually reduced to 6-8 volts after starting & a 6 volt coil is used, then during cranking 12 volts is supplied to the coil so output is higher during cranking. I don't know why you are switching to an electronic ignition, but if there isn't a valid reason like hard starting (by-passing the resistor probably won't help the starting as it is already by-passed during cranking) or some other reason, by-passing the resistor probably won't gain you anything, it will allow a higher KV spark to be produced but unless you open the plug gap to take advantage it won't gain you much as the KV will only build to the point that it takes to jump the gap which should be well below the coil max output even when resisted to 6 volts. By-passing that resistor will shorten the coil life & could cause coil overheating. The best thing to do is install a hi-output coil that is matched to the electronic ignition you have. The other reason (& probably why the by-pass is requested) is if the electronic ignition unit is powered from the coil supply side due to convenience, if that is the case you will probably have to by-pass that resistor or power the electronic unit directly from the ignition S/W circuit so it gets a 12 volt supply. You can probably find the coil power wire in that big connector by using a volt meter & seeing what wire powers up when the ign S/W is in run, stays on during cranking & is a full 12 volts. To by-pass the resistor you don't even have to remove it, just run a wire in parallel with it from it's power up point to the coil.If you find more than one wire that is powered during cranking you can disconnect it with the key in the run position & see if the coil loses power, if so you have the correct wire.

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