[Farmall] Coil On Super M

Mike Sloane mikesloane at verizon.net
Thu Jun 3 09:33:54 PDT 2010


No argument from me, Stan - realize I should have been thinking "total 
resistance" of the coil plus resistor, not just the resistor. My mistake.

Mike

On 6/3/2010 12:00 PM, Stan Bass wrote:
> On our 4cyl Farmalls, the 6V coil is about 1.5 ohms, the 12V coil
> with internal resistor is about 3 ohms, the inline resistor with a 6V
> coil on a 12V system would be 1.5 ohms. The exception to that would
> be one of the variable resistors that starts at about 0.5 ohms for
> more punch at the cold start, but then increases it's resistance to
> 1.5 ohms as it heats up. Stan(VA).
>
> --- On Thu, 6/3/10, Mike Sloane<mikesloane at verizon.net>  wrote:
>
>> From: Mike Sloane<mikesloane at verizon.net> Subject: Re: [Farmall]
>> Coil On Super M To: "Farmall/IHC mailing
>> list"<farmall at lists.antique-tractor.com> Date: Thursday, June 3,
>> 2010, 8:47 AM I would have to guess that your resistor is either
>> the wrong one or is defective. All ballast resistors are not the
>> same. With the proper resistor (at least 3-5 ohms), you should see
>> about 6 volts at the coil, not 12. By the way, the resistor should
>> installed in a spot that is relatively cool and between the
>> ignition switch and the coil.
>>
>> Mike



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