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Hello was any work done prior to this problem?
From the battery to the power distribution box there should be a fusible link. On the passenger side inspect the starter solenoid very closely. These fusible links near by should be in good shape and not brittle at all. That is going to be the problem. If you are unable to find the wire I would run a new 4ga wire from the battery for the power box.
If there is a rectangle plastic box over wiring this can be the fusible links.
I wouldn't do that. What I would do is run a build a new power wire and run it from the battery to the power box. It will cost you about $20 or close and you can use fusible links as well.