[Farmall] Need Expert Opinion

Charlie V 1cdevill at gmail.com
Thu Oct 27 10:31:25 PDT 2011


Carl,

Sorry to abandon this conversation, but I had to go 20 miles away and
get injections in both knees.  Not too much fun.

At any rate, I now understand your question.  I picked NAPA's
collective brain for you and this is what I learned, and these are
NAPA part numbers.

If they sold you a IC 7 coil it is straight 6V as you fear.  6v in and
6v out.  DO NOT USE IT.

Take it back and tell them you need a IC 64 coil.  IC 64 takes 12v in
and delivers 6v out.  That coil with your 12v supply will need no
ballast resistor in your system.

Side note.
If I can locate the pictures I of the Standard coil I used for the
same purpose, I will send them to you off list.

Hope this helps.

Charlie V.



 On Thu, Oct 27, 2011 at 12:27 PM,  <szabelsk at gdls.com> wrote:
> Jim,
>
> That's were I started trying to figure out what was going on with the
> original wiring that was on the H to start with.
>
> The ignition system was wired with a 12V coil (don't know what kind it was
> other than a Delco, and a really rusty one at that) and an external
> resistor that was in "parallel"  with the coil, not in series. The wire
> from the ignition switch went to the resistor on one side, and from that
> same side, then went to the coil (+). The other end of the resistor was
> grounded through it's mounting bracket. The coil (-) went to the
> distributor.
>
> Now when I went to replace the coil, I knew I needed a resistor in line to
> drop the voltage. I brought a 6V coil and a new resistor to go with it. I
> didn't realize that the old coil on the H was 12V, and didn't realize how
> the old resistor was wired into it until I took it of and was ready to put
> the 6V coil and new resistor in.
>
> Since the new coil implies that I don't need an external resistor, I'm
> confused as to whether or not I really need it. If I was putting the 6V
> coil on a 6V tractor, I guess I wouldn't worry about it. But this is a 12V
> tractor.
>
> The Guys at NAPA said that the fact that I had a 6V ignition system
> determined that I needed a 6V coil and didn't need the in-line resistor.
> That's where I disagree with them. I don't think putting a 6V coil in a
> 12V system without an in-line resistor is a good idea. That also doesn't
> agree with the fact that the H had a 12V coil to start with.
>
> In your response you only mention three coils
>
> ---- 6 volt
> ---- 12 volt, no resistor required
> ---- 12 volt, resistor required
>
> Are you saying that there is only one kind of 6V coil? Or are there two,
> one with and one without a resistor required? The new one I have says no
> resistor, but that wouldn't have been the case 50-60 yeas ago would it?
> Aren't the coils that don't need a resistor later/newer technology?
>
> Don't mean to contradict you or anything, just want to make sure I
> understand everything and get things wired up right the first time. I
> really need to have the H up and running this weekend.
>
> Carl Szabelski
>
>
>
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