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Tractor Talk Discussion Forum

series/parallel switch

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mike brown

04-12-2005 15:42:26




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On the tool forum there is a thread about changing 24v starters to 12v and a series/parallel switch was mentioned. Would someone elaberate about such a switch? It might solve a problem for me.

Thanks




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Jon H

04-12-2005 16:25:15




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 Re: series/parallel switch in reply to mike brown, 04-12-2005 15:42:26  
A series/parallel switch is used to connect two batteries in series for the combined voltage of both to crank the engine(ex- two 12V batteries in series to crank with a 24V starter) then after the engine starts,the switch connects both batteries in parallel so both can be equally charged from a 12V generator/alternator,or be equally discharged by a 12V accessory load.
I see little advantage of adding the complication of a system like this except on a very large diesel engine. The new generation John Deere tractors do very well with a correctly set up 12V system as is factory equipment on the 69 and later models,and an easy conversion on the earlier ones.
A series/parallel switch should still be avalible at a heavy truck parts place.

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jdemaris

04-12-2005 20:28:12




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 Re: series/parallel switch in reply to Jon H, 04-12-2005 16:25:15  
In regard to the troublesome 24-12 neg-12 pos system that Delco built for Deere. Deere lacked confidence in the capabilities of 12 volt starters at the time for use in diesels. So, they used the covoluted system. It would of been much more reliable with the series-parallel switch or, just a straight 24 volt system all the way. But, now - to install the switch into a tractor almost would not be worth the effort. I guess you could install a ground into the starter and make it a conventional 24 volt unit. You'd then have to rewire half the 12 volt system, since 1/2 the tractor is 12 volts positive ground, and the other half 12 volts negative ground. And, once you've got it all with the same polarity, you need to install - I assume - a 12 volt alternator. Seems after all that, it would be just as well to just make the whole thing 12 volts and be done with it. On a slightly different note, I've been thinking of installing such a switch on some of my 6 volt tractors that I use in the winter. I'd like to keep them somewhat original (6 volt generator and lights), but they're pretty hard to get started when it's 20 below zero F. I've been cheating and just sticking in 12 volt batteries every winter. They start great that way. I pull the light fuse out, and unhook the charging system. No big deal, but I have to charge the batteries once in awhile. Every spring, I put the 6 volt batteries back in and hook everything up again. But, maybe putting the switch in and dual 6 volt batteries is just as convoluted as changing over to a full time 12 volt system - we'll see.

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Jon H

04-13-2005 07:16:47




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 Re: series/parallel switch in reply to jdemaris, 04-12-2005 20:28:12  
The series/parallel switch would be a good option on those few tractors that use a special gear or belt driven 6V generator that drives a magneto/distributor or water pump off the rear of the generator. There is likely no 12V generator or alternator to replace such a unit. Also on a car or truck,it eliminated the problem of converting 6V radio,wiper motor,heater motor,guages to 12V.



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Jon H

04-12-2005 16:46:24




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 Re: series/parallel switch in reply to Jon H, 04-12-2005 16:25:15  
One example of a series/parallel starting switch,this one sold by JC Whitney. I used this model to convert a 50's Jeep to 12V start/6V run/charge. It worked well on a small gasoline engine,but i would think it is built too light for a large diesel. A heavy truck shop should be able to supply a heavy duty model.

Link



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mike brown

04-13-2005 10:17:05




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 Re: series/parallel switch in reply to Jon H, 04-12-2005 16:46:24  
I'm thinking JD730D electric start. 12v won't cut it . 16V works in the summer. When I got the tractor the previous owner had pulled out all the original wiring and installed an alternator. He just swithced battery cables around to start then back to 12v when it was running.



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Jon H

04-13-2005 10:44:11




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 Re: series/parallel switch in reply to mike brown, 04-13-2005 10:17:05  
I had kind of an interesting experience at a farm auction a few years ago. There was an 820 diesel that had the pony motor replaced with a steel plate to seal the top of the tractor crankcase. This steel plate had the correct flange welded to it to mount your typical heavy diesel 12V starter with the correct drive to mesh with the 820 flywheel ring gear. What really caught my attention was the little battery box beside the starter with what looked like a little group 22 car battery cabled to that big starter. When the 820's time came to sell the owner climbed up there to crank her up. To my astonishment,the thing cranked up easily. Granted,this was a spring day,but I would have expected it to need atleast a 900 amp 12V battery. A cold weather start likely would have changed the situation a lot.

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buickanddeere

04-13-2005 13:10:27




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 Re: series/parallel switch in reply to Jon H, 04-13-2005 10:44:11  
That tractor was likely rolled over with the compression release being used and the fuel already on. Once rolling over with very little load on the starter he just applied compression. There was enough rotating energy stored in the flywheel to start her up. Supposed to roll them over without fuel or compression. Then apply compession after oil pressure appears. Then apply fuel. Not a good thing to be washing the cylinder walls down with raw fuel. He wouldn't get too far on a cool day either.

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