I took the cable to a custom automotive shop. They confirmed the cable is shot. But they can’t find a fusible link to make a new cable?
So what am I supposed to do here?
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I know most people obsess over it but it's really not that critical. The fusible link probably goes to power the ECM or maybe feeding back from the alternator to the battery. It's just there to give it a chance and a place to melt if the wire were too short out so it wouldn't build up so much he from out the entire wire in that circuit. That's why they put it in that little plastic long rectangular sheet. If the wire shorts out somewhere it will just melt inside of that without damaging much else. I'm guessing that's probably the wire coming back from the alternator but I can't say for certain. You can make your own with some similar gauge wire. That's all fusible links are is smaller wire than the rest of the circuit so they will melt through.
I would just match up what's already in there. Sometimes they will be two or even three smaller wires inside. Just check them and see what they are. If they are 12 gauge wire replace with 12 gauge wire. If 14 use 14.
Go to the electrical crimp section and find you some connectors that will work. You could in theory even use like yellow size wire nuts and then shrink wrap it all or tape it or put that plastic back over top of it.
If you use crimp connectors and reuse the plastic it will all be inside and it will look just the same way it did before. If you used a wire nut on each end I would fold the wire nuts over and then tape that small part with electrical tape.
It will make no difference. Electrically it has no impact. It's not a matter of having the perfect size wire so the proper amount can get through or anything like that. Unless you were to go crazy and put very small speaker wire in there then that would not be good. If you simply replace the wire with approximately, or the same size wire it will do the same thing. They're only designed to work in a dead short to ground situation.