No power to anything

Welcome to 2CarPros.

If nothing works and you are sure the battery is good, we need to do a couple simple tests. First, if you look at the first picture below, you will see that battery power goes straight to the fuse box under the hood. It is then fused to different components. So, for nothing to work, either the supply wire from the battery has failed, is disconnected, not making a good connection at the battery, or there is no ground.

Pic 2 shows the battery and how power goes direct to the starter. The first thing I need you to check is if there is power to the larger wire on the starter. It should have 12v (battery power) all the time. Also, if it is possible, I need you to check continuity between the battery negative terminal and a the body or engine of the vehicle to confirm there is a ground. There are two grounds from the battery. One is to the body and the other the engine block.

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Here are a few links you may find helpful when checking these things:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Also, the last picture I attached shows a general connection to the main fuse box from the positive side of the battery. See if anything is loose or corroded. For nothing to be working, the problem is near the battery.

Let me know what you find or if you have other questions.

Take care,
Joe