So, don't take off the tail until you've checked all the other fuses. The main behind the battery and the fuse bank under the left fairing are easy to check.
If they are all good, go under the tail as a last resort.
Taking off the tail is a little tricky. Do at your own risk. Don't blame me if you crack it.
Once all the bolts are off and all the under-tail little black plastic button connectors are removed, you should be able to verify it is loose by pulling it back and inch or so. Wiggle it to make sure you didn't miss a bolt or button.
Once it's all free, it takes some careful stretching to get it off the bike. I usually pull it straight back as far as it will go and then reach under one side and pull it out and up a bit to start moving it around all the stuff bolted to the side of the tail frame. Continue to pull it back while stretching it wider until it is free.
Be, _very_ careful not to put to much strain on the plastic. Stay well away from the point where it will bend or break. It's tricky the first few times but once you get the hang of it you can do it easily without risk of damage to the plastics.
But...if you break it...it's all your fault. Do at your own risk or find someone you can trust that's done it before.
Luck. (and let us know if it all works out and what was the fix)