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24 to 12 volts.

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Rick Stenlund

10-05-2000 22:03:53




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I wrote in about a week or two ago. asking for h
elp in rewireing my 4020 to 12 voltsfrom 24. I got lots of replies as to not doing it as to finding out how to do it. you all say the same thing if you draw evenly off both batteres it will charge evenly, I Know this ,but we have installed a cab off a White 2-105 on our 4020 and our tractor is used every day and lots in the night. we do chors and baleing and grinding plowing snow .the cab has one fan the baler has lights and monitors theres alarms theres radios plus the tractor lights. I agree a 24 volt start is a stronger start so if any one can tell me how to draw off my batteries evenly please help

PS putting that cab on that tractor made a completely different tractor out of it it looks like a 40 seres instedof a 20 if you want to see it just wright back

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ROBERT

10-06-2000 16:22:54




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 Re: 24 to 12 volts. in reply to Rick Stenlund, 10-05-2000 22:03:53  
CHANGE IT OVER TO 12V AND YOU WILL BE HAPPEY.
I HAVE A 4020 AND 3020 THAT I CONVETED AND I LIKE IT BETTER. LIKE ONE GUY SED THE 24V WOSE EATING ME YOU
ALLWAS DEAD BATTERY IF IT WAS AN OPEN TRACTOR ID SAY GET A 24V ISOLATED ALT (MAKES A GOOD UP GRADE).BUT ON CAB
TRACTORS GO FOR 12V ROBERT



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G Taylor one battery always dead= unbalanced loads

10-07-2000 18:52:35




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 Re: Re: 24 to 12 volts. in reply to ROBERT, 10-06-2000 16:22:54  
If one battery is always going dead then it has more load than the other. The cure simply balance the 12V loads.



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ROBERT

10-07-2000 19:38:35




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 Re: Re: Re: 24 to 12 volts. in reply to G Taylor one battery always dead= unbalanced loads, 10-07-2000 18:52:35  
THIS IS A OPEN TRACTOR WITH NO LIGHTS.GAGES WAS THE ONLY 12V LOAD. THERE WERE ALWAS ONE THAN OR THE OTHER KEEPING IT FROM BEING A TRACTOR YOU COULD COUNT ON. AFTER CONVERTING TO 12V WITH FACTRY SIZE 12V
BATTERY IT CAN SET FOR MOUTHS AND START WHIN I NEED IT TO GO. P.S. I HAVE THE OLD STUFF OFF IT FOR THE NEX GUY THAT WONTS IT ALL ORIGANAL. ROBERT



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G Taylor had to have been an unbalanced load or leak

10-08-2000 00:24:38




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 Re: Re: Re: Re: 24 to 12 volts. in reply to ROBERT, 10-07-2000 19:38:35  
My Fathers 3020 diesel started reliably for four Canadian winters with only occasionally adding distilled, not tap water, cleaning the battery tops and posts. How much current did you measure flowing through the common connection to chassis between the two batteries while stopped and running with various electrical loads energized?



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ROBERT

10-08-2000 10:41:16




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 Re: Re: Re: Re: Re: 24 to 12 volts. in reply to G Taylor had to have been an unbalanced load or leak, 10-08-2000 00:24:38  
do not know it was to long ago.my 4020 work fine for years on 24v with alt for a/c tractor. on the 3020 i had the 12v stuff sating around
so i changed it and love it. ROBERT



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craig m

10-06-2000 10:59:33




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 Re: 24 to 12 volts. in reply to Rick Stenlund, 10-05-2000 22:03:53  
My dad changed 2,3020s,1 4020 and a 5020 from 24v to 12v he did not change the wireing hornes just changed some wires at the light and key switch and Put on a new alternater and starter that was 12v.
I dont know what wires he cganged if you want me to ask him E-mail me and the next time im out to the farm I will. I THINK THAT GETTING RID OF THAT P.O.S. 24V SYSTOM IS THE BEST THING WE DID TO THOSE TRACTORS!!!!! !

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Mike Aylward

10-06-2000 14:32:06




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 Re: Re: 24 to 12 volts. in reply to craig m, 10-06-2000 10:59:33  
I've seen the comments here and couldn't resist putting in my two cents worth. I have two 4020's that I use everyday- one is a '64 and the other is a '71. The '71 has a factory 12-volt system and I have converted the '64 to 12-volt. I agree 100% with Craig's assessment. In laboratory conditions the 24-volt system may be more efficient, but if you've ever seen a fire caused by a short in the 24-volt system you would run like a scared rabbit from it. I installed a 72 amp Delco alternator and 12-volt starter, along with a relay to kick the solenoid in. I used to always have "nickel and dime" trouble with the old system, and it was hard to add accessories to, always trying to keep everything "equal". I run a total of 10 lights with a total of 600 watts on both tractors with relays to run the four "hottest", and have had no trouble whatsoever. And I did no cutting or butchering to any of the wiring on the tractor. If anyone around here asks about an old 4020, they will ask whether or not it has been converted. Folks will take the converted one hands down. Too much good experience with the 12-volt, and too much bad with the 24. My humble opinion. Mike

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G Taylor 24 better, going to 42 volts

10-06-2000 14:17:24




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 Re: Re: 24 to 12 volts. in reply to craig m, 10-06-2000 10:59:33  
A higher voltage system is more efficient. Auto manufactures have decided in future models to use 42 volts rather than 12V. A 24V/12Vpos/12Vneg system works fine if you know what you are doing. Future collection value wil be reduced the tinker modifications. Higher current with lower voltage causes more voltage drops and power loss.



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John T (Just balance the loads)

10-06-2000 08:32:18




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 Re: 24 to 12 volts. in reply to Rick Stenlund, 10-05-2000 22:03:53  
Rick, you have two 12 volt batteries in series which happened to be tied to the frame at their junction point, leaving one 12 v positive grnd and other 12 v negative ground. Now, any non polarity sensitive loads across either of the non grounded battery ends and ground, will work fine at 12 volts, but its using that single battery alone which is why they placed some loads on one battery and others on other battery to use both about equally. If you want to put all your loads equally on both batteries, then you have to go to an electronics supply house and buy a sold state 24/12 vdc voltage reducer like GT was telling you about. That is connected to the opposite non grounded battery ends leaving 25.2 volts across it with a 12 volt common output to run your lights etc. Fully charged 12 volt batteris have (6) 2.1 volt cells in series and are 12.6 actual volts. The generator, in order to charge those 12.6 volt batteries, puts out around 13 to 14 or a little more volts (depends on regulator setting and if generator or alternator etc etc) and thats why the lights burn brighter when its charging. Instead of buying and using that voltage reducer, I would simply put about half the loads on each battery myself. Ol John T Electrical Engineer.

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G Taylor solid state voltage regulator

10-06-2000 02:51:13




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 Re: 24 to 12 volts. in reply to Rick Stenlund, 10-05-2000 22:03:53  
Lights are no problem. Just wire two equal sized isolated 12v's in series. Kenneth at [email protected] builds high output generators. 12V actualy 13.8V loads if isolated from chassis can be supplied from 24V through solid state voltage regulators. Avalable from any electronic supplier in three or five amp sizes.They are also current limiting in case of a short circuit. Any high school electronic/electrical student could mount these in plastic box/metal heatsink with two 24V wires in and two 12V wires out. A proper 24 to 12 conversion will take some $ to swap generator,starter,light weight wiring and person with some electrical training and experience. Can do either, both will work.

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