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Bristol Hillbilly |
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Palestine, IL 62451 | To anyones knowledge were there any 3010's ser# 3930 (1961) with a 24v positive ground systems, or have direction that I might go to find out. TIA Steve | ||
Jon Hagen |
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Hagen Brothers farms,Goodrich ND | All the pre 69 Diesel JD's were 24V as far as I know. They were neither pos nor neg ground, rather a floating ground 24V system, where the battery pack was center tapped to chassis ground to give both a pos and negative ground 12V supply to run the lights. | ||
Phred |
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NE Mo | Unsure of the 3020, but the 4020 had one battery pos and the other neg ground. Both batteries fed the key switch and the light switch.
When you turned the key to the start position, the two batteries went into series, and shot 24v to the starter. When the key was released, everything went back to 12v for lights and accessories. Some of the later wiring harnesses, had a fuse on the ground strap, that went to ground also. One reason the batteries went dead on occassion, was LEAKAGE across the switches, (both the key and the light switch)
I would assume the the 3020 and 4020 were wired alike. | ||
Bristol Hillbilly |
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Palestine, IL 62451 | Thank you for responses, My friends has both neg going to chasis one pos going to solenoid the other pos. going to stud sticking out of back end of starter. Ive messed with the ones that go neg- ground pos-neg and pos- solenoid for the 24v but this has me scratching my head. I did a search and see something similiar was discussed back in aug. Thanks again for help | ||
msb |
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Lapel, In | Right hand battery is a negative ground. Left hand battery is a positive ground. Both batteries are grounded through a fused wire coming off the positive post on the left hand battery.The ten series used flat strap ground cables off of both batteries, grounded to the trasnsmission case. 3020s are wired the same as the 4020s. | ||
Double Time |
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NW IA | Too bad Deere quit making the early harness for those. I switched our early 3020d over to the later harness last year. Wanted to keep it original, generator and all, but ended up having a later push button start instead of the key start. Ended up having to replace the key switch, and light switch as well. After all that, I think I could have made my own harness that would have been as good as a factory harness. Still consider it at times when I have to push that start button. I wonder what Deere was thinking when they went from a key start to a push button. I guess they figured it out since the 4430's and later were back to the key start. | ||
Gerald J. |
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The batteries in the 24 volt 3010, 3020, 4010, and 4020 diesels never get switched. The are wired as others have said, with the center of the 24 volt battery grounded. The generator (or alternator) and starter are not grounded, but work at 24 volts. The center tapped battery gives a +12 volt circuit and a -12 volt circuit with respect to ground for 12 volt accessories. Its important that the current for accessories like lights is the same for each 12 volt wire, else the batteries won't be charged equally. The batteries are charged in series and the starter loads them in series. One set of lights loads one battery, the other set loads the other battery. Its far less complicated than it seems. Its no different than the 120/240 volt DC Thomas Edison used in the 1880s in cities except its 1/10th the voltage and there his generators were tapped. Gerald J. | |||
Gerald J. |
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3010, 3020, 4010, and 4020 gas and lp were 12 volt positive ground. The same tractors made for diesel were 24 volts center ground, NEVER positive ground, but that center ground gives a 12 volt battery with positive ground for half the lights (and the fuel gauge) and another 12 volt battery with negative ground for the other half the lights. See my post to Phred for more details. Gerald J. | |||
Bristol Hillbilly |
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Palestine, IL 62451 | Center tap and -12volt can't seem to understand? | ||
Jon Hagen |
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Hagen Brothers farms,Goodrich ND | Not Gerald, but This is how it works. The + and - ends of the 24V battery (2-12V hooked in series = 24V ) are not connected to ground, nor are the + or - terminals of the starter or generator. All have insulated cables that carry the 24V system power, + and - without flowing through the tractor chassis parts as a ground conductor. The 24V battery , 24V starter, 24V generator are completly isolated from the tractor chassis. To make the 12V lights operate off this 24V isolated ground system, a small wire is connected to the cable that connects the batteries together at the rear. This wire connects one terminal from each 12V battery to the tractor chassis. This allows you to pull 12V from either 12V battery by connecting the 12V accessory to chassis ground and to the remaining post of each battery at the starter, then to the light and Ignition switch to power the 12V lights. That little ground wire at the rear battery connecting cable, grounds a + post of one battery to chassis ground and the - post of the other battery to chassis ground, so one battery / starter cable is - ground to the chassis, while the other battery / starter cable is + ground in relation to the chassis. Clear as mud ?? ;-) If I can find a drawing of this system, I will add it here. Edit : Try this http://www.geocities.com/gwece/deere/ Edited by Jon Hagen 12/20/2009 02:00 | ||
db1212 |
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Great diagrams Jon, THANKS! | |||
Bristol Hillbilly |
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Palestine, IL 62451 | Thank You to all , It is still soaking in but thanks to all responders I have something to look at while I trace stuff out. Steve | ||
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