8n voltage reg

[bobbyg]

i,m installing a 8 volt battery and a new voltage reg need to know how to set the polarity on the new reg

 

[G6 at Snook, TX]

8volt battery? Why not six or up to 12?

 

[JMOR]

(quoted from post at 14:19:57 02/24/10) i,m installing a 8 volt battery and a new voltage reg need to know how to set the polarity on the new reg

You don't set polarity on a regulator. Rather, you polarize the generator to match the battery polarity as installed (see attached, yours is (a) on left). Next, and just as importantly, a 6 volt regulator regulates the generator output to a voltage too low to keep an 8volt battery properly charged. So don't expect great results.

 

[Bruce (VA)]

If you are asking how to polarize the generator, JMOR answered your question. But, if you are trying to charge an 8v battery w/ a 6v generator, you're not going to be very happy.

That 8v battery is no better than the 6v battery that is supposed to be there. A 6v battery needs 7.4v to charge. That's what the v/r is set to do. An 8v battery needs about 9.6v. And, if what you meant to ask was how to adjust the v/r to increase the charge rate, tweaking a v/r isn't all that hard as long as you are prepared for the consequences of failure: a boiled battery, burned up v/r or no charge at all.

I'd clean all the grounds, replace the battery cables & either convert it to 12v or get it back to 6v. That 8v battery is not going to do much for the longevity of your points & lights &, if it's a frontmount, probably your coil as well.
50 Tips

 

[Snoman]

I have followed this forum for a couple of years now and learned a lot from it. One thing I did that is not recommeneded by the fellows with way more knowledge than I, is to put a 9 volt battery in my 9n....It was the BEST thing I ever did to it. It is a front mount 6 volt system and since I put it in, the tractor has started much better and I have not had a lick of trouble with it. I have had it in for 3 years now with no trouble what so ever. Every spring I charge it on the 2 amp setting with my 12 volt smart charger for about an hour or so. ( I charge it in the spring as I live in Northern Manitoba, Canada and I leave the battery outside in the tractor all winter). I use the tractor during the summer and have no issues with the battery, or the rest of the electrical. If/when this battery needs replacing I will be putting another 9v in.

 

[JMOR]

(quoted from post at 16:56:23 02/24/10) I have followed this forum for a couple of years now and learned a lot from it. One thing I did that is not recommeneded by the fellows with way more knowledge than I, is to put a 9 volt battery in my 9n....It was the BEST thing I ever did to it. It is a front mount 6 volt system and since I put it in, the tractor has started much better and I have not had a lick of trouble with it. I have had it in for 3 years now with no trouble what so ever. Every spring I charge it on the 2 amp setting with my 12 volt smart charger for about an hour or so. ( I charge it in the spring as I live in Northern Manitoba, Canada and I leave the battery outside in the tractor all winter). I use the tractor during the summer and have no issues with the battery, or the rest of the electrical. If/when this battery needs replacing I will be putting another 9v in.

Like this?

On a more serious note, on a 9N the 3 brush gen is capable of reaching much higher voltage output than the 8N regulated generator. So, I am not surprised at your success even though it will stress the generator fields a bit.

 

[Bruce (VA)]

There is a considerable difference between the charging system on a 9N & an 8N. The initial question here involved an 8v battery in an 8N. The key difference between the two systems is that an 8N has a v/r & the 9N doesn't.

Those 9v batteries are kinda rare. Can you post a picture of it?