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Tractor Talk Discussion Forum

starter

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wayne gulliver

12-05-2005 14:22:46




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Tractor Friends,can you tell me if I can get my Super C starter rewound to work on 12 volts? I need to rebuild it. Wayne




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gene bender

12-06-2005 04:13:36




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 Re: starter in reply to wayne gulliver, 12-05-2005 14:22:46  
Ever thought about going to an 8V battery you dont have to change anything else. They have one that fits in the batt box. You will be happy with the way it will start.



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Dixieland

12-05-2005 18:07:03




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 Re: starter in reply to wayne gulliver, 12-05-2005 14:22:46  
Hi Wayne, don't waste your money getting a 6 volt starter rewound for 12 volts. The 6 volt starter will be just fine to use on a 12 volt system. Make sure that you change your lamps to 12 volt and if you are using an alternator, make sure you have a negative ground.

Good luck,

Rex



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jerrycpp

12-05-2005 15:21:40




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 Re: starter in reply to wayne gulliver, 12-05-2005 14:22:46  
If you leave it at 6 volts, it will turn twice as fast as it did. If you rewind it for 12, it will turn the same speed as it does now on 6 volts. The only caution is if you do leave it at 6 volt, be sure you let it completely wind down before trying a restart. You can bend the shaft, tear up the drive, or break the nose housing if you hit the start button while the starter is still turning or the engine is kicking back.

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old

12-05-2005 14:55:06




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 Re: starter in reply to wayne gulliver, 12-05-2005 14:22:46  
As Rusty has said. Fact 6 volt starter on 12 volts only draws half the amps it does on 6 volts.



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buickanddeere

12-05-2005 16:20:10




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 Re: starter in reply to old, 12-05-2005 14:55:06  
Six volt starter supplied with 12V will draw approx 1-1/2 to twice the current. Power output can be two to four times of that on 6V. Depends on rpms, magnetic flux saturation in field coils etc. In any case, hit that 6v starter with 12 and don't worry about it. Actually if you went through the electrical faults in the Super C's system. You won't need the 12V as a bandage solution to solve the symptoms but not the cause.

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old

12-05-2005 16:43:51




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 Re: starter in reply to buickanddeere, 12-05-2005 16:20:10  
Basic law of eletrics double volts on a given load and that decreases amp draw. Thats why a motor will do more work when used on 220 volts then it does on 110 volts, and use half the amps



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m.m. curvin

12-06-2005 02:53:14




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 Re: starter 120 versus 240 in reply to old, 12-05-2005 16:43:51  

Please clarify motor will do more work hooked on 240 versus 120 agreed the amperage will reduce by half explain more work please.



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old

12-05-2005 20:18:22




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 Re: starter in reply to old, 12-05-2005 16:43:51  
Buick, your right I looked it up in a book I have. I guess you loose a lot if you don't use it. Don't remember the good old Ohms law as I did years ago. E=IR



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Coloken

12-05-2005 16:59:25




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 Re: starter in reply to old, 12-05-2005 16:43:51  
In the example you refer too, there is more winding when at 220 volt, there for more inductance (resistance) so you are right. But when you hook 12 volt to a 6 volt winding the current will go up. If it were pure resistance, it would double. Things get way more complicated be cause it is inductance and that varies with the speed and load. At a locked state, it would be twice with twice the voltage. Actually about 9 volts and 4 volts depending on cables etc.

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buickanddeere

12-06-2005 15:37:12




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 Re: starter in reply to Coloken, 12-05-2005 16:59:25  
A DC motor does not limit current via inductive resistance as an AC motor does. The current is limited via "back emf". Same but different. The Dc motor also has a generator effect as it runs. That explains how the current when rotating, stays below what only ohms law would indicate.



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RustyFarmall

12-05-2005 14:29:52




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 Re: starter in reply to wayne gulliver, 12-05-2005 14:22:46  
You do not need to rewind it for 12 volts. Leave it just as is and go ahead with 12 volt conversion. The 6 volt starter will be just fine. Millions of 12 volt conversions have been done, don't of any that rewired the starters.



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RayP(MI)

12-05-2005 17:50:13




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 Re: starter in reply to RustyFarmall, 12-05-2005 14:29:52  
What Rusty says: I have a Farmall 200 with 12volt battery, and alternator. 6V starter works just fine on 12v - no changes made!



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