When you test for voltage at the ignition side of the coil, did you check it while actually cranking?
Not sure how your tractor is set up, but if the electrical has been changed, and the ignition switch has a start position, a failing switch can loose contact when in the start position.
If that test proves good, move the test light to the distributor side of the coil primary, ground the clip end to the chassis, crank the engine over. The light should flash each time the electronic switch opens and closes. If that test fails, and you rechecked the module wiring and mounting, and know the distributor is turning, sounds like the electronic module has failed.
Like others have said, they are polarity sensitive. Also the coil must be the proper resistance for the application. A 6 volt system needs 1.5 ohm, a 12v needs 3 ohm, measured across the primary terminals of the coil.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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