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Tractor Talk Discussion Forum

battery charging/jump starting

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brad siegmund

03-08-2007 07:46:11




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Does anyone know how to jump abattery when it consists of two units, say 2x 6 volts=12 or 2x 12=24volts. they should be in series, right? So could't you hook positive to one and negative to the other of the two batteries?




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RAB

03-08-2007 13:15:33




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 Re: battery charging/jump starting in reply to brad siegmund, 03-08-2007 07:46:11  
BE SAFE!!!!Don"t copy the ones that say different to mlauk.

You ALWAYS connect the last connector to the engine/frame, well away from the battery. You ALWAYS disconnect the frame connection first. This applies whether pos. or neg earth. It should 1) reduce the risk of an exploding battery, and 2) will reduce your chance of a direct hit from an exploding battery from that reduced risk.
You can never completely remove the risk of an exploding battery but if you don"t take precautions like above you are risking life and limb (particularly your eyesight from sulphuric acid in the eyes, as you will probably not be thinking safety about them either!).
If you have ever had a battery blow, you would not ever do it like Pete etc.(connecting both jumpers to the battery posts.

It may often be lucky that it is an old and discharged battery that blows, and the acid is somewhat reduced in concentration (low specofic gravity) - but you never know.....

Regards, RAB

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mlauk

03-08-2007 10:27:59




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 Re: battery charging/jump starting in reply to brad siegmund, 03-08-2007 07:46:11  
I jump mine by attaching positive to cable on starter and negative to frame.



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Pete in MD

03-08-2007 08:21:38




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 Re: battery charging/jump starting in reply to brad siegmund, 03-08-2007 07:46:11  
Provided you're jumping/charging at the combined voltage of the two batteries, disregard the posts that are linked together by a common cable. Hook the POS clamp to the POS post on one battery and the NEG clamp to the NEG post on the other battery. Whether your tractor has a POS or NEG system makes no difference.



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IH2444

03-08-2007 08:13:21




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 Re: battery charging/jump starting in reply to brad siegmund, 03-08-2007 07:46:11  
you can charge each battery seperatly in the string.
Ie if you have a 12 volt charger and 2 12 volt batteries hooked up in series to make 24v. you can clip the charger onto each 12 volt battery and charge that battery.
Jump starting this way does not work very well though. I would seperatly charge each battery up and then start from the batteries.



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John T

03-08-2007 08:12:36




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 Re: battery charging/jump starting in reply to brad siegmund, 03-08-2007 07:46:11  
Brad, If you wanna jump or charge two six volt batteries wired in series (= 12 volts) using a 12 volt charger or another 12 volt battery YES its the series combination of the two you jump/charge. Then you still jump/charge + to + and - to - BUT ITS THE + ON ONE BATTERY AND THE - ON THE OTHER THAT GETS CHARGED. The + would be on the + of one six volt battery and the - on the - of the OTHER six volt battery. The other 2 NON JUMPED battery post of the two sixes are joined together in the middle tie point. Sames true for two twelves in series if you wanna charge at 24 volts.

Clear as mud???

John T

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rrlund

03-08-2007 08:23:25




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 Re: battery charging/jump starting in reply to John T, 03-08-2007 08:12:36  
A little off subject,but what always fascinated me was the ground wire between the second and third 6volts on a JD 730 electric start to give you 12 volts to the lights and accessories instead of the 24 to the starter.



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John T

03-08-2007 08:52:02




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 Re: battery charging/jump starting in reply to rrlund, 03-08-2007 08:23:25  
Yep, On those systems, at the mid tie point of the four batterys its also bonded to frame ground. That way you have 12 volts from the outermost untied + on one battery and the outermost untied - on another for 12 volts Pos ground and 12 volts Neg ground used to run the lights. The two ouermost untied remaining + and -terminals are called the hot A and B circuits that wire to the light switch so some 12 volt lights are fed from one battery and other lights the other battery to try n keep thier loads balanced. The Starter and Generator are TWO WIRE 24 VOLT ISOLATED FROM FRAME GROUND DEVICES and the batterys are all 4 charged in SERIES with a 24 volt generator. Piece of cake right????? lol

Take care now yall

John T

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brad siegmund

03-08-2007 13:03:38




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 Re: battery charging/jump starting in reply to John T, 03-08-2007 08:52:02  
JohnT, What happens when you charge a,say 6 volt battery with a 12 volt system or say a 12 volt battery using a 6 volt source.Is anything being damaged?



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John T

03-08-2007 13:40:32




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 Re: battery charging/jump starting in reply to brad siegmund, 03-08-2007 13:03:38  
Brad, First of all in order to charge a battery the source must be HIGHER voltage to make current flow into (charging) instead of out of (discharging) it. Normally, the genny is just a bit higher voltage then the battery, maybe on a 12 volter 13 to 14.5 volts or so depending on its type n quality n rating n the Voltage Regulator etc. Sooooo what happens if you try n charge a 6 volt batery with a 12 volt charger ??? THE ANSWER DEPENDS if its only a real cheap light wimpy low current charger it may (depends on its overload protection n lots other things) well still charge it fine (Ive done it no prob), PROVIDED you donT leave it on too long or overcharge and the lower current n wimpier it is less the chance. HOWEVER if its one of those bigger heavier high current booster type chargers YOU CAN RUIN THE BATTERY cuz too much current may cause excessive outgassing n acid boil over maybe even damage the plates. An overcharge is in a way WORSE then an undercharge cuz it can totally ruin the battery n make it go flat n not take a charge, has to with the lead n adic n lead sulphate n other chemical stufffff f.

Sooooo oo depending on the charger and whether or not its a modern so called Smart Charger and its amp and overload rating but MOST IMPORTANT its amps capacity if youre careful n dotn leave it on too long you can charge a 6 using a 12 volt charger buttttt ttt dont try with a high amp dumb charger at high charge rates it may (depends on lot of things) blow up or warp the plates or ruin the battery DONT TRY THIS AT HOME LOL

Basically to charge a storage battery you simply pump electrons INTO it versus it forcing electrons out into a load which depletes n discharges it. It converts chemical energy into electrical energy up to a limit

John T

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rrlund

03-08-2007 09:46:56




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 Re: battery charging/jump starting in reply to John T, 03-08-2007 08:52:02  
Sure is...clear as mud. All I know is that I had one that the lights quit working on one time,an old peg legged 2 cyl mechanic asked me if that ground was broken? I fixed the wire,problem solved. WHO KNEW.



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