6 volt versus 12 volt

The 6 volt batteries give about 400 more total cca than
the two 12 volt Would it be smarter to go with the 6
volt . But how do I hook up the charging system?

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Which tractor u referring to? Installing 2 6 volt in series or 2 12 volt in parallel or using one 12 volt has nothing to do with the charging it stays the same making sure it is grounded the same as it was.
 
If I am following this correctly, you have a late 4020 12 Volt diesel.

Originally, it would have had two 6 Volt batteries in SERIES, it has been converted to two 12 Volt batteries in PARALLEL, and you want to go back to two 6 Volt batteries.

Correct?
 
Right now everything is including the alternator Is hooked to the starter lug so it charges both batteries . Had one tractor that was 24 volt and I could only hook it to charge one battery or it would fry the alternator in about 1/2 a second
 

Well, there would be no issue in doing that!

Are the batteries side-by-side or on opposite sides of the tractor?
 
Two 6V batteries hooked in series would add up to 12V but the total cranking amps would stay the same as it is for one battery. Two 12V batteries hooked in parallel would still give 12V but the cranking amps of the batteries would be added together. Either way the electrical system will see 12V of total battery voltage - it doesn't really matter to the charging system how that voltage is being provided.
 
2 6 volt in parallel is still 6 volt , even if you hooked 4 or more up its still 6 volts. you must mean 2 6 volt in series. if you want a higher cranking amp then it 2 12 volt in parallel.
 
Series means that the positive post on one battery is hooked to the negative post on the second battery.
Parallel means positive to positive and negative to negative--the way you would hook up jumper cables.
Hope that helps.
 
Due to the series resistance within battery cells, the voltage drop at a given current will result in a substantially lower cranking voltage (as a percentage of battery voltage) with two 6V wet cells in series versus two 12V in parallel. Expect about 4.5V cranking with the 6V paired (actually 6.3V each, unloaded) which is nearly a 30% drop. Expect about 10.2V cranking with two 12V batteries (really 12.6V) in parallel, which is a 20% drop.

It goes back to Ohm's Law, and parallel resistances being half of the resistance of each path. In case you are bored you can research that.
 

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