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#11
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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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Rusty 149 project with: QA42 snow thrower 38" deck Barn fresh 1811 with: 44c mowing deck QA42A snow thrower 42" snow blade |
#12
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Also, the coil fires when the magnetic field collapses----- (points just opening) |
#13
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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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Rusty 149 project with: QA42 snow thrower 38" deck Barn fresh 1811 with: 44c mowing deck QA42A snow thrower 42" snow blade |
#14
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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
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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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Cooperino 100, 104,125, 126, 2x129's, 804, 1211, 1641 |
#16
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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.
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Rusty 149 project with: QA42 snow thrower 38" deck Barn fresh 1811 with: 44c mowing deck QA42A snow thrower 42" snow blade |
#17
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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
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I call bull hockey! That only happens south of the equator after the vernal equinox.
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Rusty 149 project with: QA42 snow thrower 38" deck Barn fresh 1811 with: 44c mowing deck QA42A snow thrower 42" snow blade |
#19
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Obviously, you are not left handed.
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#20
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