HUGE thanks to RUBI for all the info. That was exactly the problem. Pulled the PDC, and found the red/white wire in the F6 spot that was crimped to a green wire. Not sure why it was that way, but further down the line it switched back to red/white. The first joint closest to the fuse was pretty corroded at the crimp point. Cut that out and joined it with a new connector. That was the ticket. Put it all back together and the fuse didn't pop! Started right up, and now I am back in business.
I had the battery disconnected during this excursion, and I got rid of code 25, but I still get code 42.
I also don't know if it is because of being parked on my sloped driveway for a week, but the exhaust is pretty strong. I hope this did not effect the O2 sensor I replaced just a couple months ago.