Re: 6 volt systems

Posted by jdemaris on December 11, 2003 at 19:22:45 from (209.23.31.57):

In Reply to: 6 volt systems posted by abane on December 11, 2003 at 10:26:17:

I read the other posts but can't say I totally agree. I like 6 volt systems and I kind of like to keep my old stuff original when I can. I like the slow but steady cranking, and the look of the old 6 volt generators. Convertering 6 volt to 12 however, will make a night and day difference in cranking speed and cold weather starting. I don't care how big a battery you use, or how large a gauge battery cables. A 6 volt battery is capable of a hair over 6 volts with no load. When cranking the voltage will drop depending on the size of a battery. Average 6 volt tractor will crank at 4 to 4.5 volts. Try it a -30 degrees F, and maybe 3 volts if you're lucky. If you put an oversize battery in, you might up the cranking voltage to over 5. But that's it. Put a 12 volt battery in, and use it on a 6 volt starter, and you'll be cranking at over 9 volts. Oversize the 12 volt battery and you might be cranking at over 10 volts. Same starter will crank faster on 9 volts than on 4.5, and there's no way around it.
I've got over 20 tractors, crawlers, diesel and gas. I've tried to keep many of them 6 volt. But . . . take a day that's well below zero, and it's a crap shoot if the 6 volt tractors will start (unless I plug in the block heaters).

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