![]() The negative coil post connects to the distributor lead on a negative ground system. If your tractor has a gasoline or propane engine,you need to swap the wires on the coil primary terminals. Going to neg ground should not be a problem ,all you need to do is change the + - connections at the battery and install your alternator. The starter does not care if it is connected pos or neg ground,no problem there. Think I can figure out the wiring but wondered if I have to get a different starter or will they work either ? Hope I don't get in trouble for horning in on your post, but I think you got some very valuable advice. A 60's -70's Ford car/pickup starter solenoid makes a good auxillary cranking relay. The stock wiring simply cannot supply the 50 amps 12 V that the starter solenoid needs through that stock,light gauge cranking wire. ![]() If you make up your own kit,add an auxiliary cranking relay,it will make it crank better,and burn up less starters and solenoids. I have converted several 4020's to 12 V ,the years ranged from 64-68. Connect the White (#1 ) lead to the small wire in the original regulator harness that lights the Gen light when connected to ground with the key turned on. Buy a replacement alternator plug at the parts store ,any GM 74-86.,connect the heavy red (#2 ) lead to the BAT stud on the alternator rear. ![]() You simply connect the heavy 24 V pos and neg wires at the starter to the 12 V pos battery connection at the starter solenoid,at the alternator you connect the 24 V pos and neg generator /regulator wires together to the BAT stud on the alternator rear. The 24 Volt wiring harness will work with little modification. The original in dash Gen light works fine to excite a 10-12SI delco alternator,Depending on the year model,all you need to do is install a 12 bulb or remove the inline 24 to 12 V resistor (just unplug the resistor and plug the male/female Gen light wires together ). Like the others say,if you have some fabricating and electrical skills,you can do it for about 1/2 what Deere wants.In addition to what Jon said, I would leave the original breakers in place as they save your wiring harness from going up in smoke if something shorts out. John Deere sells a conversion kit that is very complete (including an auxiliary cranking relay ) but is expensive. If you do a lot of start stop or use the lights a lot you need to run a hevier wire to the batteries than the present one as the delco will let the smoke out of the little batery wire. Throw the regulator over your sholder, take the wire from it and go to the back post on the alternator. Take a new wire from keyed power, some were, put a small idiot lamp in it under the dash to act as a small reistor and plug into the left termanal. Run a short jumper wire from the out put post on the back of the alt to the rt turmanal on the delco with the pully faceing away from your body and you looking at the back. Put on a delco alternator, you will have to notch out the bracket and space the pully out with a coupel of flat washers. Throw the circut beakers over your sholder. Get two ground straps and go to frame ground were battery box mount is on each side. Use both battery cables you already have, put on the starter post, remember you have to spread the black one out and force it onto a positive battery post. Here is what you do, get a starter from a junked out 4430, (big starter, good power oh oh oh oh )īolt it on. I bought a used starter from Mike's Equipment in Buhler, Ks, and bought a remanufactured alternater from the local parts house and a few electrical connections and perhaps a small amount of wire and had a 12v system that is far and away less troublesome than the 24v system Deere designed. If I remember correctly, it cost me less than $200 to do it. I don't know your capabilities with electricity, but if you are average or perhaps a little above you can do this for a lot less money. Dealership wants about $1200 to do it.holy kruats!!!!! I want to convert my 4020 this winter and would welcome any suggestions, tips, and direction you might have. ![]() Seems there was someone who had experience doing this and gave the source of a kit that worked pretty well. I remember a thread on this site, or a similar one, about converting the wonderous 24 v JD system to 12v. ( logon | register )Ģ4 v to 12 v conversion on JD 4020.where?
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