On a lot of earlier first gens there is no link in them. My 87 came from the factory without a fuse link.
The smaller lead on a positive battery cable is the charging wire from the alt.
1987 s-10 blazer 4x4, 3.4, 700r4, np207, 3.73 gears...dana 60s, built 5.7 sitting in the shop working on custom frame and linked suspenstion (soon to be a true S-TON blazer)
1991 gmc sonoma reg cab, bone stock....3.4 swap coming