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8n battery

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Author  [Modern View]

05-22-2020 18:26:59

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Starting to work on a 8n that's been sitting a long time.
Battery is probably long gone but I brought it home and put it on a 12v charger. Problem is it's a 8v battery. I'm debating about swapping it to 12v as I really dont want to buy a 6v battery for it to just sit around.
Anyway I'm wondering with the 8v battery would they have done something to the regulator? I also remember something about it quit running after it got warmed up. I'm wondering if the coil would crap out on 8v?

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05-23-2020 08:34:15

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
Thank you for all the replies with good info. Guess I will bite the bullet and buy a 6v battery. Last one I bought sat around and is junk now. I will have to try to keep this one charged up.

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Bob - MI

05-23-2020 06:55:32

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
Had an 8V in my 2N when I got it. Weak compression made the tractor hard to start so the previous owner took the easy route and upped the voltage. I started looking into what I could do to simply make the tractor start easier and after a full round of points/plugs/carb cleaning/new coil/ignition switch/plug wires it fired right off. When the 8v died I replaced it with a 6v and never had starting problems.

You mentioned coil related shut down and that's exactly what mine did with the 8V in it. I ran the new coil for a while with the 8v and it was ok. Went to 6v about a year after that and all was fine.

The tractor got occasional use so not a lot of hours on the setup. In the winter however it would run for 1~2 hours plowing snow and never had a shutdown but the cold might have cooled the coil down a bit??

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05-23-2020 06:08:53

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
I purchased an 8N once with an 8 volt battery. It lasted about one month and then I had no way to charge it. I replaced it with a 6 volt battery and never looked back.

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Bruce (VA)

05-23-2020 03:22:45

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
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. Trying to charge it with a 12v charger gets you a boiled battery. 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. 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, it’s 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 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, it’s only about 2 volts that makes the difference between no charge and a boiled battery.

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

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05-22-2020 21:20:31

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
It's off now. There was another post about charging them I think. Maybe I will look for it before I continue.

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05-22-2020 21:03:09

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
the battery seemed to be charging on 12v. I decided to unhook it for the night. Might just go pick up a 6 volt battery. I have a few tractors I could use it on.

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05-22-2020 21:06:36

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 21:03:09  
You might overcharge and have a batt accident along the way. Hope your batt is isolated away from the danger of an acid spray. Baking soda is a great neutralizer for that acid.

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05-22-2020 20:44:40

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 Re: 8n battery in reply to Olliejunkie, 05-22-2020 18:26:59  
Theory being the 8V battery needs it's own designated charger for 8V. The 8V batt is supposed to give near the same cranking speed as the 12V. 6V then charges it fairly well but it still needs to visit the charger about once a week to bring it back up to 8V to maintain the faster cranking speed. 6V genny putting out roughly 7.35 volts as I seem to recollect.

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