Forget the negative side of the coil for now. Take your "test light", and attach the ground to engine ground, turn the key on, and touch the other end to the coil pos. post. Does it light up bright? If it does, then attach the neg side of your tester to the neg side of the coil, with the pos side to the pos side of the coil. Crank the engine. Does the light flicker?
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