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Conversion of 9n to 12v

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RonofOhio

07-12-2001 10:46:58




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Im converting to 12 volts using the single wire alternator method. I'm also going to use the original 6v coil, so I'll be using a ballast resister in series to cut the voltage to 6 volts. Should I also use the existing resister which is located in the terminal block in series or should I bypass it intirely. I've downloaded a wiring diagram from Nseries.com, and it appears that I should bypass the resister. But if the original resister was to cut voltage from 6v to 3v, then shouldn't I want to use both of them in series to cut the voltage from 12v to 6v and them from 6v to 3v. It runs well using only the ballast resister, but I wouldn't want to ruin the coil or points by using 6 volts if they are designed for 3v. Help???

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Tim

07-12-2001 13:57:58




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 Re: Conversion of 9n to 12v in reply to RonofOhio, 07-12-2001 10:46:58  
Instead of talking voltages it actually comes down to amperages. In a series circuit the total voltage of the circuit is equal to the sum of the voltage drops so people check for voltage at the coil rather than the amperage of the system (they are related however). The original system has a 0.4 ohm resistor with .6 ohms resistance in the primary winding. Consideration could be taken for the resistance of the wiring but this is minimal. Total resistance is 1 ohm. Current is equal to total voltage divided by total resistance. Therefore the original ignition circuit had 6 amps flowing through it. To be safe this should not be exceeded. Anywhere from 3 to 6 will work. Do the math and add all your resistances up (primary coil winding + original resistor + ballast resistor) divide this into 12(volts) and you have the total amperage. Remove the original resistor value and redo the equation. If you stay under 6 amps you're good to go, if not keep the original. As you can see a lot depends on the value of your ballast resistor and the resistance in the primary winding of the coil. In most case the original can be bypassed, but be safe and do the math.

Good Luck

Tim

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TimK

07-12-2001 13:08:06




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 Re: Conversion of 9n to 12v in reply to RonofOhio, 07-12-2001 10:46:58  
I think you may have the wrong alternator. One- wire jobs take too much rpm's to charge for the low reving N. Suggest before you hook things up, check the archives on this issue, unless, of course, you can't exchange the one-wire alternator regardless, in which case, I guess you plow ahead. My $.02.



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Tim

07-12-2001 15:11:08




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 Re: Re: Conversion of 9n to 12v in reply to TimK, 07-12-2001 13:08:06  
Good point. That is true for most alternators. I found however if you use a 2 inch or smaller pulley, the alternator will excite immediately, even at idle speeds.

Have a good day.

Tim



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Jim WI

07-13-2001 10:37:42




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 Re: Re: Re: Conversion of 9n to 12v in reply to Tim, 07-12-2001 15:11:08  
Only problem with the smaller pulley is that the OEM belt is big enough to not like that tight of a curve. This will likely wear the belt faster than would otherwise be the case.



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Tim

07-13-2001 13:48:28




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 Re: Re: Re: Re: Conversion of 9n to 12v in reply to Jim WI, 07-13-2001 10:37:42  
That's right Jim. I just X-reference the required size to a 'True Blue' power rated belt (or equivalent) which is very durable but more pliable than the OEM. It is sure nice having it start charging as soon as the engine fires up.

Have a good day!

Tim



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Dell (WA)

07-12-2001 11:56:53




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 Re: Conversion of 9n to 12v in reply to RonofOhio, 07-12-2001 10:46:58  
Ron..... ..If'n ya gotta converts to 12 volts and yer gonna use the OEM 6 volt frontmount coil...then ya gotta use BOTH a 12 to 6 volt converting resistor AND the infamous OEM "ballast resistor" mounted on the backside of your dashpanel. HOOK both resistors in series like flashlight batterys from the ignition switch to the frontmount ignition coil terminal.

If'n ya do it as I just 'splained, then your 1-wire 12 volt alternator conversion should work just fine..... ....Dell, who is a 12 volt advocate for the right reasons, and has not found the right reason to convert his eazy starting 6 volt 52 8N, and I know how to do it right. Remember the 6 volt mantra, "keep 'em clean, bright, and tight".

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Tim

07-12-2001 15:18:31




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 Re: Re: Conversion of 9n to 12v in reply to Dell (WA), 07-12-2001 11:56:53  
My 6 volt system worked fine. However some implements (sprayers etc..) require 12 volts to run the pumps. In this case by converting increases the versatility of the tractor. If this is not the case though, the 6 volt system has worked for 50 years, why not 50 more!

Tim



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Gene Miller '48 8N

07-12-2001 11:28:44




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 Re: Conversion of 9n to 12v in reply to RonofOhio, 07-12-2001 10:46:58  
Well, since it appears you're going to do this although I sure don't know why, splurge and get the 12 volt coil from your friendly New Holland dealer that DOESN'T need the resistor and then USE the stock resistor with it to save your points.

My tractor came converted unfortunately and with the screwed up wiring I've spent WAY too much time trying to fix it. 6 volt batteries are still available as are generator rebuilds and the tractor runs fine at the 6 volts it was designed for and trust me, If your tractor is screwed up it won't run any better at 12 volts!

Gene Miller '48 8N

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tlak

07-13-2001 05:46:17




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 Re: Re: Conversion of 9n to 12v in reply to Gene Miller '48 8N, 07-12-2001 11:28:44  
Im all for 12V conversions, if you hook anything up to it its a working tractor. It opens up the use of all the 12V accessories lights, sprayers, etc. I could have bought a cheaper battery charger if I didnt have to find the one with the 6V option. The batteries in all my vehicles are 12V, can get another batt without waiting for the 6V to charge. Since I converted the 6V batt sets in the garage collecting dust, no use for it. Whether theres a proper way to jump with 12V or not I think you get bleed back to all your 6V components which is why you probably end up replacing the regulator with the generator unless you totally isolate the starter but then you need juice to the points.

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Tim

07-12-2001 15:18:47




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 Re: Re: Conversion of 9n to 12v in reply to Gene Miller '48 8N, 07-12-2001 11:28:44  
Another option if all you want is a little more 'snot' in your starting system for sub-zero start-ups, I put 8 volt batteries in them. They are not high enough to hurt anything but gives it a little more RPM starting in cold weather. I bought these batteries at 'The Battery Man' stores. Adjustment of your generator output is sometimes required.

Food for thought!



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