Posted by oldfarmkid on April 26, 2020 at 07:16:48 from (24.178.151.122):
In Reply to: confused over coils posted by Charlie M on April 25, 2020 at 06:32:57:
Don't think my comments on 6 volt coil labeled no ballast required, was taken seriously. Plus comment on using bosh motorcycle 6 volt coil was dismissed as foolish. The first item should be taken seriously. If new coil is mislabeled as no ballast resistor required, a burned up new coil and being stalled miles from home could be the result. The values that are in question on coil mislabel are as follows. Normal spec for 6 volt coil resistance is 1.25 to 2.0 ohms. Since the ballast resistor is in series with the coil, if a ballast resistor is built into the 6 volt coil as the label infers, internal resistance should read between 4.65 to 5.4 ohms. Ballast resistors for tractors I've worked on measure 3.5 ohms. But the new 6 volt coil in question measured 1.3 ohms well within spec for a common 6 volt coil with no internal ballast. If coil is labeled correctly, where did the added resistance of the internal ballast resistor go? Proof of my conclusion was a weak spark with new coil, no ballast resistor. With ballast resistor, spark was much stronger blue in color. And would produce a spark across a 2 3/4 inch gap on an ignition spark gap tester. Inferring lawnmower, car motorcycle coils being used also minimized the facts of my comments. The spec sheet for a Bosh 6 volt coil built for a 1975 BMW R90/6 motorcycle fits the specs and physical size for a 6 volt tractor coil. Similar power, points ignition. Voltage is 12 volts, but two coils are in series so no ballast is required. With all that said, just saying I stand by my comments and suggestions Mr John T.
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