Go BottomJD 4020 Starting System
 | ronald65
Join Date: Aug 2005 Posts: 107 Montana 
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2008-10-20 157389
Any one have a schematic for 12/24 volt starting system.Neighbor has one that won't crank after replacing one Battery,says the other one is Good.Thanks; Ron
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| hardwood
Join Date: Dec 2002 Posts: 3583 iowa 
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2008-10-20 157393
Ronald; I had a 4010 with the same weird system, but I don't have a schematic anymore. My experience with replacing one battery in a two battery system has never been too good, seemed like the other old one just took the new one down to nothing. There are a ton of other things that can be wrong, but putting both batteries in new might be the solution. Frank. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2008-10-21 157414
Ron, Frank is right about the batteries from what we've seen, one follows the other! The hard part of testing these batteries is there are not to many testers that can put enough load on them to give an acurate test without using a carbon pile battery tester.
They are basically a simple system but I'm at the same point as Frank, never needed a wiring diagram to get one figured out! ....
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| ronald65
Join Date: Aug 2005 Posts: 107 Montana
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2008-10-21 157415
Thanks Guys; But Neighbor has removed som wires from start switch. There are broken wires,Cut off wires replaced wires in the loom to Starter. Switch is bad(intermittent in crank position, but even when & if they can get new switch,Tgere are too many things I don't know without a schematic. There is Bat A;Bat B; ST; Gen; LT and another LT terminals on Switch.The only one I can trace is Heavy Blue wire from ST term to what I think is a C/B on Solenoid.I Have a Typical Picture of the System in one of my books, But I need Actual Colors of wires & where They GO .I"ll try the IT manual when I get one. Thanks, Ron ....
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| hardwood
Join Date: Dec 2002 Posts: 3583 iowa
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2008-10-22 157438
Ronald; The newest 4010 is well over 40 years old. given the age and condition you describe of the wiring harness the only real solution is to strip all the old stuff out and start over, switches, battery cables, ground cables, relays, etc, etc.. This will be pricey from Deere, but they would likely print out a schematic for you. I think??? the later 4020's went to an alternator and all twelve volt syatem replacing the 12/24 system on the 4010's and early 4020's, so be sure to have a serial number to take along. Frank. ....
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| jdgreen
Join Date: Jul 2003 Posts: 232 Maryland
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2008-10-25 157488
Another option is to install a 12 volt conversion kit. You add a 12 volt starter and alternator along with some minor wiring changes to cconvert ot a "normal" 12 volt system. Around $600.00 from ytmag.com. http://www.yesterdaystractors.com/store/parts/convcat.htm. I'll see if I can find a schematic for you. ....
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