I doubt there would be a staple which, if it did penetrate a single wire, would be grounded on the opposite side of the puncture. If a staple did penetrate a wire, it would have to penetrate a second wire in order to complete a connection to a ground. Pretty sure the only way to blow a fuse is to connect the wire related to that fuse to a grounding point.
OC may be onto something with the idea of checking the junction box, or checking wherever it is that the movable cord becomes a secured point.
2018 Forester 3051S (aka Clyde)
2015 Wrangler Toad (aka Bonnie)
At some point during every day you suddenly realize nothing else productive is going to happen the rest of that day. For me, it usually occurs around 9 am.