Been having issues on my 91 f150 4.9 with charging battery so i got a new batt and alternator. Still the issue goes on checked the green fuse link and boom its fried. I see the 3 wires black/orange (looks like a 10 gauge), black (another 10 gauge), and yellow (maybe 14 gauge just eyeballing) go into the one fuse link. Is there a crimp sleeve that has one side 16 gauge for fuse link and the other extra wide to accommodate 3 wires? I use the word crimp sleeve you may know then as heat shrink connectors. Ima noob.

 

The technical name is "butt crimp" because it gets crimped down after the wires are butted together inside the metal tube. It doesn't matter which side the wires go into - you can put the fusible link & 1 wire into one side and the other 2 wires into the other side.

Its outer plastic insulation does not shrink - even when heated. But many people have trouble getting good crimps - it requires the right pliers & the right technique for the wires NOT to pull out. This shows a similar 1/4" spade crimp, but the process is the same for each side of a butt:

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There are also heat-shrinkable tubes with solder rings inside, but not big enough for this application.

This page shows & explains the correct wayS to repair a fusible link wire:

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You can also buy ready-made fusible links with a ring on one side & a butt crimp on the other. This one is not 16ga: