HELP fusable link dies while driving

As soon as the fusible link is connected, power goes to ignition switch, headlight switch, fuse box, lighter wells, and more. Any one of these circuits can cause a fusible link burn open. That's what its for after all.
Just for the sake of mentioning... rain water in the fuse box has caused this too.
First place I would look is lighter wells. Then harness connector for ignition switch located under the column, then headlight switch harness connector.