Yes I agree sounds like aftermarket accessories baking. Mostly when wires short or melt fuses blow. Unless someone ran some homemade circuits and used to big of fuses.
I also think we need alot more information then a wire melting to pinpoint a cause.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html