Go down to your local auto supply and buy a 12volt tester( about $10.00, You are looking to make sure you have + and - current. I know it is frustrating,but, no spark starts at the positive supply into your box or distributor, or resistor.
Follow the current. No current check your GROUNDS, most of the time, a bad ground will be the culprit. Fabrication is much more complicated, you can do it.
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