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Make sure the box is grounded, no good ground, no go
 

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Thinking out loud here, to kill 2 boxes, you would think there's a wiring problem. Now 14.5 volts isn't that bad, and it's really the coil that takes a beating with high voltage. Unless it's the coil and ballast being to low a resistance and overheating the ECU. All those parts have to be matched. What's the voltage at the coil, both sides while it's running. when you get it going again.
 
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