Hi Simmo
I've got a big tank version from 1985. As far as I'm aware there is no fuse to speak of.The black bit on the positive lead is a circuit breaker which I believe stops the whole bike, not just the lights. If your battery is ok, my guess would be that you have a wire loose somewhere, or a poor connection. Its just a case of patiently going through anything obviously lighting related on the loom.
Good luck and merry xmas/happy birthday
Dave
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