battery replacement

I have a 9N, 6V, front distributor,3-brush generator with cut-out relay. Can I use a 8-V
battery on this system and if I can will I need to make any changes?

Thanks
 
You need 9.5 volts to charge an 8 volt battery; your generator puts out 7.5 volts to charge the 6 volt battery. Trying to charge an 8 volt battery with 7.5 volts gets you a perpetually discharged 8 volt battery operating at about 50% capacity. Adjusting the 8N voltage regulator to put out 9.5 volts requires special tools and expertise to do it correctly. Or, you can try it yourself as long as you are prepared for the consequences of failure: a boiled battery, a burned up v/r or no charge at all. Cranking up the output on a 2 or 9N generator will increase the charging voltage but at the cost of overheating the generator. And your headlights won't last very long. Having a partially discharged 8 volt battery in your tractor is no better than having a fully charged 6 volt battery. At 8.43 volts, your 8v battery is fully charged. And it needed 9.4 volts to get there. But, at 8.04 volts, your 8v battery is only 25% charged. In other words, its no better than a 6v battery at that point. If you already have an 8v battery and the v/r was adjusted to put out 9.5 volts, chances are very good that it is no longer doing that. Because usually the adjustment was made by bending the points arm. Is that how ignition points are adjusted? You will also need to keep checking your voltage output every few months because it will change with both time and temperature. Remember, its only about 2 volts that makes the difference between no charge and a boiled battery.

Yes, some folks who knew what they were doing could adjust a v/r correctly and git it to allow a constant 9.4 volts output. If you have an 8v battery in your tractor, maybe you are one of the lucky ones. But do check the voltage and the specific gravity to find out .

IMHO.cleaning up the grounds, replacing the cables and buying a new 6v battery is a lot easier.
75 Tips
 

I shoehorned in the biggest/most CCA 6V battery I could get through the cover. PITA to put in/take out, but I've got many years from the last one (carcraft don't have # handy) and it get damm cold here.
 
I have had two Deka batteries on my '41 9n. The first one lasted 9 years,only going bad when I broke my kneecap and couldn't get to it to keep it charged. If a 6v battery in good shape will not start your tractor,there's something else wrong. Mine starts with a couple of revolutions with full choke,then the key on with about 1/2 choke. An Old Guy showed me that trick many years ago when my '48 Dodge with a flathead 6 was hard to start in Winter. The starter switch or the ignition switch may be at fault,if the fuel and spark is good.
 

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