Try following the battery cables to their other ends and make sure that they are super tight and clean there too.
You can also try checking the fusible links, which are pictured in images 1 and 2 below, located under the hood of the car. Failed fusible links can cause all sorts of bad things to happen, and it's a common problem.
Finally, you might also look at the other fuses in the underhood fuse box, the layout is in image #3 below. In particular, look at fuses 7, 8, and 9. Check this guide out if you need some pointers on checking fuses:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Actually, it wouldn't be a bad idea to inspect the connections and grounding of the fuse box as well. Again, a loose connection here could cause all sorts of wacky things to happen.
Let us know what you come up with, we'll go from there.
Images (Click to make bigger)
Saturday, December 22nd, 2018 AT 8:45 PM