Is this a fusible link and what connector is this?

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I am redoing all the battery cables in my 68 C10 and came across this red wire that previous owner had connected to the battery-it looks like it’s 16g but the insulation isn’t thick like a typical fusible link I’ve seen. It also appears to be about 18 + inches long until it jumps up in size to the 12g wire that goes across the radiator shroud. In about the same area there is the below, unused connector that comes out of the wiring harness…anyone know what this is?

It is my understanding that stock these trucks had a junction block which the fusible link attaches to but I don’t necessarily need/want to recreate that. If someone just added an 18 inch section of 16g wire will that function as a fusible link or is that too long and should I just replace with an actual labeled fusible link?
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