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6 volt conversion

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marconi

11-10-2002 13:45:02

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hi .. my 47 8n wont start unless i jump it with 12 volts .. i have a 12 volt coil and a 12volt condenser.. along with a 12 volt battery.. i wonderd if any of u can help me.. if i change to 12 volt and purchase a 12 volt alternator.. will the 8n remain positve ground ??? or do i change it to negative ground.. thank u very much

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HTR

11-10-2002 19:13:01

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Re: 6 volt conversion in reply to marconi, 11-10-2002 13:45:02

If you use the 10SI Delco alternator like most people do, you will need to go to negative ground. I suggest getting the plug that goes in the alternator with a diode built in. It only costs a dollar or so more, and is much easier to install. The universal mounting brackets leave alot to desire. Take your time and fabricate a bracket heavy enough to hold the altenator solid. It bugs me to see a pulley runing at a forty five degree angle. A thirty five amp. alternator is enough for the 8n. Take the pulley from your generator, and ream the hole to fit the delco. It will charge plenty with the three wire Delco and the original pulley.

Most twelve volt front mount coils say not to exceed 13.5 volts. The alternator will exceed that, and may damage the coil. If you go through the original resistor, it will drop the voltage to about ten volts at the coil, and seems to hold up. If you use your accumulated parts, and the delco alternator, you will have a more enjoyable tractor.

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Dave Smith, With a name like

11-10-2002 16:18:41

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Re: 6 volt conversion in reply to marconi, 11-10-2002 13:45:02

Marconi, This must be a trick question.
Dave <*)))><

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Ron

11-10-2002 14:59:22

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Re: 6 volt conversion in reply to marconi, 11-10-2002 13:45:02

Ground (chassis) connection will depend on type of alternator used. They are available both ways but most common is neg ground. Starter will make no difference. I've been using stock 6 volt starter with 12 volt system for over a year. Just don't crank long periods with 12 v on 6 v starter. If you connect bat wrong acording to alternator you will know it imediately by the dramatic things that will happen up to and possibly a fire under the gas tank!!! Get some expert help if you aren't sure or it may cost you bg $$$

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Jim Cox

11-10-2002 20:43:14

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Re: Re: 6 volt conversion in reply to Ron, 11-10-2002 14:59:22

The six and the twelve volt starter both use the SAME field coils to get the work done, as well as the same armature. the twelve volt has an additional coil, called a shunt coil, think of it as a governer. If you ever free spin the six volt version on twelve volts, you'll throw a commutator bar in the armature (just like throwing a rod in a crankcase) and then you'll have a reason to head into town to a rebuild shop. Ask them if they can get the ACE brand fo field coil, i THINK the number is something like ST-212-HT. it has an extra field winding for torque. Good Luck either way you go

Jim Cox
electrical reman guy

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Dell (WA)

11-10-2002 14:37:11

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Re: 6 volt conversion in reply to marconi, 11-10-2002 13:45:02

Marconi..... ....I'm certain what you said make sense to you, unfortunately I flunked mindreading and it makes NO SENSE to me..... ....respectfully, Dell

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Huh?..................bg

11-10-2002 14:01:41

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Re: 6 volt conversion in reply to marconi, 11-10-2002 13:45:02

Sounds like you have already converted it. Try the explanation once more.....

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marconi

11-10-2002 19:10:18

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Re: Re: 6 volt conversion in reply to Huh?..................bg, 11-10-2002 14:01:41

sorry... all..... on that six volt conversion.. I left out an important sentance....I have not converted it over to twelve volts as yet...i have a fully charged six volt battery... the tractor will only start when its cold.. once it warms up.it wont start . the motor cranks fine.. when i hook up twelve volts to it . it eventually starts... My question is.. I want to change it over to twelve volts....i have a twelve volt coil and a twelve volt condensor and im ready to put it in..once i instal it along with an alternator do I need to change it over to negative ground .. and will i need to change that resistor near the ignition switch....Thank you so much for your input.. I do apologize for the lack of information. I thank you all again..... Marconi..

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Jim WI

11-11-2002 10:28:46

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Re: Re: Re: 6 volt conversion in reply to marconi, 11-10-2002 19:10:18

Don't convert to 12v yet (if at all). You need to fix the problem you have first. I think Dell's got his finger on the most likely problem.

After you've fixed the problem, then decide if you really need to convert to 12v. I bet you'll decide you've no reason to do so.

(BTW, my 2N has a 12v conversion that I did myself.)

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Dell (WA)

11-11-2002 01:50:34

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Re: Re: Re: 6 volt conversion in reply to marconi, 11-10-2002 19:10:18

Marconi..... ...guess what?, the reason your frontmount 6 volt tractor starts when cold but not when hot, is because you have a bad 6 volt frontmount coil. When it gets hot, the insulative tars melt inside the coil and short out some of the coil windings and now you don't have enuff sparkies to start when hot. Amazingly enuff, it "cures" itself overnight when it cools off. Replace your BAD 6 volt coil.

And specifically, yes, 12 volt alternators absolutely DEMAND negative ground.

Have you even considered doing a little research in the N-Board Archives at the top of the page about the trials and tribulations of the electrically challenged trying to convert to 12 volts? Read'em and weep.

But if you are ABSOLUTELY bound and determined to convert to 12 volts. And if you are absolutely certain that you have one of those new 12 volt frontmount coils, then DO NOT USE the "infamous ballast resistor" on the backside of your dashpanel with the 12 volt coil. Understand?

Use my secret tricky 12 volt conversion resistor instead, it'll make your 12 volt coil last a long time. Make a 1/2 ohm 10 watt current limiting resistor from a Radio Shack 2-pack 1 ohm, 10 watt resistor (p/n 271-131). With the resistors side-by-side, create a parallel resistor assembly by twisting the resistor wires together. Solder and terminate and install this new current limiting resistor inplace of the ballast resistor. Understand? ..... ..... .respectfully, Dell

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