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Check the fuse in the Edlebrock pump harness to make sure someone didn't stick the wrong fuse in there, should be 7.5A.
Are the wires melted anywhere else besides the end?
Check the crimp on both lugs going to that post (Edlebrock and OEM) make sure they are solid, a loose connection would generate the heat in that spot.
When current is opposed (resistance), the result is heat. Loose connection = high(er) resistance = heat.
If you have the tools, I would even go as far as to re-crimp a new lug on the Edlebrock harness to ensure it's good.
Visually inspect the wiring harness going from that terminal to the Edlebrock fuse and the OEM wire feeding the fuse box. If something rubbed thru prior to the fuses/fuse box and was intermittently grounding out, that could do it.
If you have a multi meter, with the battery disconnected, meter set to measure resistance, connect one lead to a good chassis ground and the other lead to the nut on the fuse block that connects to the + side battery post and start wiggling and poking the wire harness(s) (Edlebrock and OEM to fuse box) and see if the resistance jumps around. Should be 0 ohms and stay there, or very close to 0. If it jumps around, you have a short somewhere in that harness.
Electrical problems are challenging, even when you're hands on, nearly impossible over the internet. You might end up having to take it somewhere.
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