Just wondering if any one knows how to test a coil to tell if its 6 or 12 volt.
ANSWER: Many original coils designed for use at 6 volts have a primary winding resistance as measured between their small + and - terminals around 1.25 to under 2 ohms (1.5 ohms typical)......THEY ARE LABELED 6 VOLTS
Many original coils designed for use at 12 volts have a primary winding resistance around 2.5 to 3.5 ohms (3 ohms typical)... THEY ARE LABELED 12 VOLTS
One reason being is so the points dont draw and have to switch too much over 4 amps so they dont burn up too quick. If you use a coil designed for 6 volts on a 12 volt tractor unballasted it can overheat badly, while if you use a coil designed for 12 volts on a 6 volt system the spark will be weak
NOTE Im NOT talking about high performance (Mallory and Accel etc) or elec ignition coils, Im talking many older original stock farm tractor coils for points and condensor ignitions THIS IS NOT A PERFECT TEST but when I was a used tractor dealer I used this method many many times AND IT WAS ALWAYS CORRECT. They could make a coil that would work at 6 or 12 volts but my best guess is its ohms would be well over 2. Still when you walk into NAPA they will ask if you want a 6 or 12 volt and will sell you one or the other more likely then they will sell you a UNIVERSAL coil for either 6 or 12 volts (I doubt they will have one)
NEXT does the tractor have a 6 or 12 volt battery?????????????
Is the genny a 6 or 12 volt??? Many 6 volt are black labeled while many 12 are red labeled
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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