duster sparks from battery ground

RedFish said
you can buy fusible links anywhere fuses are sold. My memory sux but I think the OEM was a 14awg link.
Year One offers a reproduction of OEM if thats more to your liking.

X2. Don't try and use a fuse. Any fuse needs to be at least as large as the max rated alternator output, unless you've bypassed the ammeter