I'm assuming this is a Pertronix or similar conversion.
If the black wire went to ground, that would likely cause the module to fail.
There is a requirement of 3.0 ohms or higher resistance across the terminals of the coil. If you don't know what coil you have, you can check it or find someone to check it for you, or replace it with a new one that is of known value.
Running the wrong coil, like a 6 volt coil, or a 12 volt that requires a resistor will stress the module and shorten it's life, and also overheat the coil, especially if the ignition is left on not running.
Those conversions are generally bulletproof, but things can happen. Be sure everything is right and try again. I've never had one fail without a reason.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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