The do not run off the same fuse but they do run off the same blinker. Try turning on the key, click the left/right (check both) turn signal and then operate the 4 ways on and off at the same time. Work the 4 way switch back and forth 10 to 25 times and see if you get any short winks or blinks from the system.
Turn signals are usually on their own fuse in the glove box and hazard are on with the brake fuse. If this does not work, I would look at the blinker. It is possibly bad. Check each pin of the blinker and see if there is power there when you turn on the 4 ways or turn signals. Replace Blinker. Make calls to parts stores and dealer for location of this blinker.
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