For your 99 MY, take a look at this thread
Turn Signals Not Working When Tilt Wheel is Lowered?
It shows the connector that could be pulled apart, causing the turn signals not to flash.
This is the easy 1st check, could be the MFS, which is the next thing to check ( I am guessing it is the MFS, but don't want to send you on a wild goose chase ).
The flasher is the same for both the hazards and the turn signals, so it is not that.