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Do I need a ballast resistor??

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Brian Schoenber

07-21-2000 14:11:46




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I recently converted my IH 300 Utility from 6 to 12 volts negative ground. I installed a 12 volt coil and have seen in numerous diagrams you should put a ballast resistor on the positive side to knock the voltage from 12 to 6 volts. I thought I remember reading a post on this web site awhile back saying if you had between 3-4 ohms resistance between the leads on the coil a ballast resistor was not necessary, it was already built in. I measure 3.5 ohms on mine. Do I still need to install the resistor?? What will happen if I do or don't install one? Any comments would be appreciated.

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Corky

07-22-2000 05:27:38




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 Re: Do I need a ballast resistor?? in reply to Brian Schoenberg, 07-21-2000 14:11:46  
Brian sence you allready installed a 12v coil you don't need the resistor.It is used only if you keep the stock 6v coil. Good luck



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ltf in nc

07-22-2000 07:45:51




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 Re: Re: Do I need a ballast resistor?? in reply to Corky, 07-22-2000 05:27:38  
A ballast resistor is required. It can be either internal or external. Without such a resistor the coil will overheat and the point life shortened. A load resistor is used when a 6 volt coil is retained, when converting to 12 volts, to limit the voltage to six.



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twopop

07-21-2000 15:47:46




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 Re: Do I need a ballast resistor?? in reply to Brian Schoenberg, 07-21-2000 14:11:46  
if the resistor is built in you do not need another one.if you put one in you will not have enough voltage to operate the coil,you would probably get spark but it will be weak.check the # of the coil with your local parts house,they should be able to tell you if it has a builtin resistor



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