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Was the fuse blown?
At the port are the sides grounded?
At the port is the base power?
Are you sure the component your plugging in does not have an internal fuse that has failed?
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Use a volt ohm meter set to ohms to check the ports outer shell for ground tested to a seat bolt to confirm the port has no resistance to ground. The base can be tested the same way but it needs to be DC volts, and you should see 12.6 volts. Let me know those results.
It seems like we are not done yet. If your still wanting/needing help, I m still available.