I have a schematic from a Haynes manual, and it shows no "master fuse" or anything of the sort. But you can easily troubleshoot your problem. You'll need a test light or a basic multimeter to measure voltage. You can the meter at Radio Shack for about $10 if you don't have one.

The battery connects directly to the starter. Then a circuit goes to the light switch terminal 30 and from there goes to #1 fuse. So begin by checking for voltage at each of the nodes above and you will identify at least one problem.