[G.A.S.]

I would head back in the direction of the starters sylinoid. Or the connections at the starter.
My son just had a simular problem I fixed for him. we had a new starter installed almost a year ago and on our first snow storm he was plowing and the blazer quit. sometimes it would click and then just quit al together.
come to find out that when the new starter was installed, the installer did not line up the main power cables ear with the allignment slot in the sylinoid and it bent over cracking the sylinoids housing. Now this worked fine for almost a year so it was kinda frustrating.
removed the starter and there it was, pieces of the sylinoid broken off.
A inline fuse rarley blows at the starters connection so the first place I would look would be the sylinoid and its connections.
process of elimination