Joey - Just one fuse, for any of the 82 Series and Cyclops. Without looking at the diagram, I think you will find that the battery feeds starter solenoid directly, then the power is directed to the fuse that protects the rest of the tractor. The power should leave the fuse and go to the key switch which directs the power to the three circuits (start, run, and run with lights, as well as to the pto).
Bad grounds are a constant enemy, but if you lost both the pto and lights, is is probably not a bad ground as they are grounded separately. At this age, these tractors are notorious for corroded connections.
You really need to go through all the connections and clean any corrosion mechanically (file, wire brush, sandpaper), chemically (plastic safe electronics cleaner), then most importantly, use dielectric grease on every connection. Push the dielectric grease up into the connector then put back together.
Since you lost multiple circuits, start with the connector on the back of the key switch. I just worked on one with a friend that was so corroded we had to replace the key switch and connector.
Check for 12V coming from the fuse to the key switch. Don't trust a visual on the fuse, as sometimes you can't see when they have blown. Keep checking for 12V as you work through the system. Until someone (hey Steve Williams!!) comes up with a wiring diagram for you, use the 1882 diagram we have here, it will be the same except for the ignition feed instead of grounding the magneto with the key switch.
If you blew a fuse, you either wired something wrong or inadvertently touched a hot to ground while working on it. Don't increase the fuse size or you will melt wires next.
Let us know how you do.