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The 1" long black cylinder located between the two 12-gauge wires, below, and the single wire, above, is just a urethane encased butt splice. Cut the two wires directly below the splice and join the replacement 16-gauge fusible link to the stripped ends of the wire pair. It may be easier to use an uninsulated 10-12 gauge butt splice to join the three wires together. Solder the connection using 60/40 rosin core solder as shown in Vile's thread and then insulate with some marine grade (adhesive lined, dual wall, polyolefin) heat shrink cut to about twice the length of the butt splice. Likewise, crimp and solder an uninsulated ring terminal onto the free end of the link and shrink-seal the terminal barrel.
Interesting bd, I guess I'm missing the need to cut in half? Wouldn't you just get all three wires in the middle and crimp once, instead of the normal two crimps? I'm assuming by your reply that you would avoid the three way butt connectors?
I do not recommend combining two wires into one splice just for convenience with a fusible link.- 12 gauge wire is good for up to about 35 amps- Two 12 gauge wires could be intended to handle as much as 70 amps total (although not likely)- 16 gauge fusible link is designed to protect a single 12 gauge wire, so it should burn through at about 20 amps to protect the wire- The way that splice is plumbed, it is protecting both wires and may burn through at about 20+ amps total current.Most parts stores have standard GM fusible link wiring like this 14 gauge link that is designed to protect a 10 gauge wire. https://www.amazon.com/Dorman-Help-85620-Gauge-Fusible/dp/B000COD0TW You can also buy bulk fusible link wire in different gauges from NAPA and make your own links by crimping a connector on each end.My truck came with a 63 amp 10si alternator, and IIRC the stock charge wire and fuse-box feed wires connected to the starter are both 10 gauge with a 14 gauge fusible link. I now have a 93 amp 12si alternator, and upgraded to an 8 gauge charge wire by pulling one off a newer 88+ GM truck that had a higher amp alternator. The new wire had a black molded 12 gauge fusible link.Bruce