During engine bay rewiring I also replaced my cables from the battery to the horn relay, the Generator wiring and the fusible link with an inline fuse holder.

Off the top of my head I started with a 60A fuse (battery to horn relay), and last week when I wanted to drive off my garage ramps I shot the fuse, aparently while cranking.

Does anybody have have an estimate/experience what current the original '70 Cutlass Supreme fusible link is "rated", or if this was a one-time blowing fuse, before I start going to 80A or 100A?

Thanks

Ed:

Ground wires are all new, sufficient gage and tested. I can safely say that the starter current is not running through this fuse.

 

Something is not right. I replaced mine with 10 gauge wire, 30A fuse and it works with no issues. Any time the fuse blows it's sign of a problem.

 

It's 60A battery to horn relay that blew. My "fusible link replacement fuse" between horn relay and fuse box did not blow.

I don't think you get very far with 30A total when the blower motor off the horn relay is 30A alone?

 

Battery to horn relay, 10 gauge wire and 30A fuse
It's been working just fine. I have done this few months ago.