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John Deere Tractors Discussion Forum
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Electrical Questions

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Jerry 52 jd A

11-17-2005 19:03:16




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Hi I have an off topic question.
I have a 24 volt winch I want to use on my trailer to pull non running tractors or whater on to it. My question is this can I charge a 24 volt system with my 12 volt truck? I think it can be done, I hav submitted a drawing of how I think it will work. I was wondering if anyone has ever tried this or if it will even work. Any help is appreciated thanks.
Here is the link for the photo.
Link
Jerry

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Jery 52 A

11-19-2005 22:36:17




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 Re: Electrical Questions in reply to Jerry 52 jd A, 11-17-2005 19:03:16  
Thanks to all who replied I will have to look in to the s/p switch. I appreciate this forum. Thanks again!
Jerry
PS sorry about the small image.



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Randalp

11-18-2005 19:44:08




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 Re: Electrical Questions in reply to Jerry 52 jd A, 11-17-2005 19:03:16  
John T has it right. The series/parallel (SP)switch used on older highway tractors is what you need. See your local truck/trailer wreckers, or get a rebuild. While your schematic will work on paper, as others have pointed out, you will need a heavy switch not all that common. The SP switch is designed for this purpose.
I can help with the wiring of the SP if needed.

Finally, I get to contribute to this incredible forum!

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John T

11-18-2005 06:05:28




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 Re: Electrical Questions in reply to Jerry 52 jd A, 11-17-2005 19:03:16  
Jerry, I couldnt get the images to display. On some semi trucks they used a series paralell solenoid arrangement to connect the batterys in series for 24 volt starting then back to 12 volts running. I cant see how youre wiring it but with the proper relays and avoidance of 24 backfeeidng 12 volt curcuits, I see no reason why some sort of wiring cant accomplish your task. Remember to match up the current ratings of any switches or solenoids used.

John T

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jdemaris

11-18-2005 05:07:55




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 Re: Electrical Questions in reply to Jerry 52 jd A, 11-17-2005 19:03:16  
It hurts my eyes trying to look at the images you posted - they're a little small. If your idea is to charge two batteries in parallel, and hook in series to run the winch - that's fine - as long as the resulting 24 volts cannot feed back to the vehicle's 12 volt system.
John Deere, in a way, did something like it with their 3010s/3020s/4010s/4020s that utilized a 24 volt cranking system and a dual 12 volt operating system (one neg. and one pos. ground).
The U.S. military, in many road vehicles, uses 24 volts cranking along with some degree of a 12 volt system - but they use two separate 12 volt alternators, two batteries, and an array of relays.
You could simplify things by using a step-up transformer, i.e. 12 to 24 volts - but - it would have to have the amp. capacity for your winch motor.

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Bob

11-17-2005 19:41:43




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 Re: Electrical Questions in reply to Jerry 52 jd A, 11-17-2005 19:03:16  
There's no reason that wouldn't work, with a very HD switch.

And the first time it gets plugged into the truck with the switch set in the 24-Volt position, there's gonna be a HECK of a spark!

Have you tried the winch with 12-Volts, to see if it would meet you needs for power and speed operated in that mode?

Depending upon how much this is used on a given trip, you could just use the 12-Volt source from the pickup, and connect a 12-Volt battery (that had been charged overnight, at home) in series with one of the winch leads. More than likely, the extra battery would do the job, and could later be recharged.

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