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I think I killed my ecu


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Ok so i have been having trouble getting my 77 280z to start and I think I now know why. Time and time again I have been told that an ecu will hardly ever be the problem, but this time im pretty sure it is. In a quick and sloppy attempt to get the car running, the two leads for the ecu which connect to the positive and negative terminals of the battery were both connected to the positive side of the battery so the 4 spots on the ecu that should have been grounded, 35, 17, 16, and 5 have been receiving 12 direct volts. Will that direct current kill my ecu and require me to replace it? Thanks for any input.

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