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There is no way a fuse should be getting hot. They are rated by the amps the wires/components can handle (actually the fuse is a lower rating), so the only thing that can cause a fuse to get hot is exactly what I'm seeing in your picture, CORROSION. The fuses are not making good contact in the holders due to rust.


Geeeez, no kidding, thats terrible! I would think the fuse would blow first. I'd hate to see what your bulkhead connector looks like. Looks like a fire waiting to happen!



Nope, the rust is LIMITING current. The heat is caused by the extra resistance. Heat in Watts is I^2*R (as I recall). So, with a very low resistance, which fuses and wire are SUPPOSED to be, there won't be much heat, but start adding resistance (even though the current will go DOWN) and you start making heat.