I need electrical help.

No. There is only two things that cause heat and they might be intertwined. One is too much current being drawn by something, and the other is a loose connection. This can be right at the fuse clip, the rivet for whatever terminal at the fuse clip, or the wire end where the harness connects to the box.

Think bathroom / portable heater. There are larger and smaller ones, some maybe 800w, some up to about 1500 w. They are "safe" on a good tight properly wired outlet, and so long as the cord plug is not damaged. But add some damage, a "well used" loose outlet, maybe an extension cord with the (should be outlawed) molded plastic end connectors, and you have smaller wire in the extension, loose connections at the connectors, and pretty soon you havel warm soft plastic and noticable heat. And of course the larger wattage heaters get hotter.

Perhaps a better example is the headlight switch Every once in awhile you hear about someone with headlights cycling on/ off.

Unless someone has installed large wattage headlamps, the cause is usually either a "weak" breaker built into the light switch, or loose/ corroded connections at the light switch. Either the poor connections are causing heating, or the contacts in the built in breaker have gotten corroded, and heat from poor contact. So the breaker pops, cools down, and tries it again.