I'm not a mechanic so could be wrong (someone please correct me if I am) but I believe if your turn signals work, the fuse is fine (I don't think there's a separate fuse for the turn signals and one for the hazards).
I suspect it's like our 03 Phaeton which does have separate relays for turn signal and hazards (I'm guessing most / all cars do). Behind the dash, you should be able to find 2 relays (square / rectange boxes about 1" long) that look like this:
(not my picture, just stole it from the internet. Here are a bunch more examples
http://www.google.com/search?q=turn+signal+relay&client=firefox-a&source=lnms&tbm=isch&sa=X&ei=0Y8cU... (link to google images doesn't seem to work properly - you might have to click on 'Images' in the top bar of the page).
One will be for your turn signals, the other will be for our hazards. If it's like our Phaeton, they'll be pretty much the same (except that one of ours chimed, the other one did it - on ours, the turn signal chimed, while the hazards didn't - I prefered the other way so swapped them out. The easiest way to test them, is simply swap them - if right now, your turn signals work but your flashers don't, after swapping them, your flashers will work but your turn signals won't.
If you need more help, you'll probably have to contact your chassis manufacturer (not Tiffin) and now that I think about it, our Phaeton is on a Freightliner, your Bus might be on a Spartan so it might not be the same. As far as the fuses, if it is a Freightliner chassis, I believe those are in the outside compartment under the driver's seat.
Hope this helps.