My car will not get power?

My car will not get power. I have replaced the battery and still no power. I had a dead battery in it and charged it. The car got power for a second then died that's when I put the new one in and still no power. I know the cables are clean and it's grounded properly. Any thoughts? It's a 1995 Ford thunderbird.

You know the cables are clean and it's (battery) grounded properly - but it is not. When you find the bad connection in either the positive cables or the negative cable, clean up the corroded connector surfaces and re-attach them there will be power again. Time to start undoing connectors and looking inside.
A multimeter would be a big help finding the bad connection.

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