Wiring Issue

[Youngbuck7072]

My truck died & i went to start it up again, turned the key and heard a click then nothing. I replaced the ignition switch and charged the battery, still nothing. No headlights or power to anything. The insulation around the end of my positive terminal wire is melted. Its been taking a few tries to crank it lately before it died completely. I'm thinking I blew a fusible link but any ideas on what it could be guys? the truck is in the mud a lot by the way, maybe that has something to do with the problem
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