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  #11  
Old 11-05-2018, 07:31 AM
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Vrobert Vrobert is offline
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Coop, thanks for the pic.

I do still have a question about the coil. Can I use a coil designed for negative ground systems in a positive ground tractor? The coil I found in the model G is a John Deer ABC011 6V. I can't find any spec for positive or negative ground but I don't know if it matters for which system it was designed. The tractor had been running shortly after restoration if that matters.
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  #12  
Old 11-05-2018, 07:33 AM
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Originally Posted by Vrobert View Post
Points will work without a condenser however they will burn out from arcing without a good condenser. I will replace the points if I can't clean them up.



That's the dumbest idea ever! How will I reach the key with my tongue on the coil?

I forgot to mention that the distributor wasn't locked down, therefore, I suspect that the points didn't have a good ground. I plan to add a ground wire and report back.

I'll take some pics as well. This pic is similar to the restored model I'm working on.
While points open and close providing a complete circuit for the magnetic field in a coil, they will only allow the engine to run just a tad above idle if a condenser is defective.
Also, the coil fires when the magnetic field collapses----- (points just opening)
  #13  
Old 11-05-2018, 07:55 AM
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To add a little more detail, when the points first open the condenser acts like a closed set of points, in other words, it has a low resistance. The condenser quickly builds up a charge and current stops flowing, acting like an open set of points, causing the magnetic field to collapse. Without the condenser, a spark or arc will jump the points gap when they open and they get burned.

Condensers can fail 3 ways: dead short, open, or lose capacity. (Condensers are electrical capacitors)
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  #14  
Old 11-05-2018, 09:39 AM
green 4 acres green 4 acres is offline
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Quote:
Originally Posted by Vrobert View Post
Points will work without a condenser however they will burn out from arcing without a good condenser. I will replace the points if I can't clean them up.



That's the dumbest idea ever! How will I reach the key with my tongue on the coil?

I forgot to mention that the distributor wasn't locked down, therefore, I suspect that the points didn't have a good ground. I plan to add a ground wire and report back.

I'll take some pics as well. This pic is similar to the restored model I'm working on.
"Points will work without a condenser" #&€$!
have you been talking to jmech ?
please tell us how a point system works ...how it fires the coil

no do not use your tongue , but stranded holding a coil wire can tell you it is weak
  #15  
Old 11-05-2018, 02:09 PM
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cooperino cooperino is offline
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Quote:
Originally Posted by Vrobert View Post
Coop, thanks for the pic.

I do still have a question about the coil. Can I use a coil designed for negative ground systems in a positive ground tractor? The coil I found in the model G is a John Deer ABC011 6V. I can't find any spec for positive or negative ground but I don't know if it matters for which system it was designed. The tractor had been running shortly after restoration if that matters.
Its been awhile but what my old brain thinks it remembers is this. Positive and negative ground coils are wound differently.. Thats not to say they wont work in either situation tho because I think I used a standard one hooked up backwards in a positive ground system once.. Let me take a look at something to try and remember....

Edit.. Positive ground or negative ground should make no difference to coil. Only thing that matters is correct voltage and resistance.
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  #16  
Old 11-05-2018, 09:36 PM
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Originally Posted by green 4 acres View Post
"Points will work without a condenser" #&€$!
have you been talking to jmech ?
please tell us how a point system works ...how it fires the coil
I suspect you're poking fun but since you asked, I actually know this from physics class. If you think I'm a bore just move on but I find it interesting.

When a wire passes through a magnetic field, electrical charges are forced along the wire as current. The high voltage coil has maybe 2000 times as many windings as the primary coil. The primary winding is energized by the battery like an electromagnet. When the points open, the magnetic field collapses, passing through the secondary coil windings, inducing high voltage across it. The ratio of primary to secondary windings dictates the magnitude of the voltage at the spark plug.

There are two rules that help explain the behavior of transformers, coils, motors, generators, etc. They are both strangely called the "right-hand" rule but they are different.

1: Make a fist and stick your thumb out. Your thumb points in the direction of current in a wire and your fingers wrap around the wire in the direction of the magnetic field around the wire.

2: Point your index finger like a gun in the direction of the magnetic field, your thumb straight up in the direction the wire moves through the field, and your middle finger straight out from your palm in the direction of current flow in the wire.

I could go on but I don't want to get banned.
Attached Images
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File Type: jpg RHR 1 for current.jpg (16.6 KB, 80 views)
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  #17  
Old 11-05-2018, 10:17 PM
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Wow, that explains a lot!
I always wondered why water fills up my light bulbs when I open the oven door.
Never thought me being left handed, had anything to do with it, but I now see the reason my compass always points south.
  #18  
Old 11-05-2018, 10:49 PM
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Vrobert Vrobert is offline
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Originally Posted by ol'George View Post
Wow, that explains a lot!
I always wondered why water fills up my light bulbs when I open the oven door.
Never thought me being left handed, had anything to do with it, but I now see the reason my compass always points south.
I call bull hockey! That only happens south of the equator after the vernal equinox.
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Barn fresh 1811 with:
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QA42A snow thrower
42" snow blade
  #19  
Old 11-05-2018, 11:05 PM
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I call bull hockey! That only happens south of the equator after the vernal equinox.
Obviously, you are not left handed.
  #20  
Old 11-06-2018, 02:41 AM
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DeltaCub DeltaCub is offline
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Originally Posted by ol'George View Post
Wow, that explains a lot!
I always wondered why water fills up my light bulbs when I open the oven door.
Never thought me being left handed, had anything to do with it, but I now see the reason my compass always points south.
Quote:
Originally Posted by ol'George View Post
Obviously, you are not left handed.
Hey ol.George....you been nippin' at the "rumatiz" medicine again?
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