The ignition switch needs to be on because on a normal install, in my experience, the power to the flasher is from an Ignition "ON" fused source. Turn signals don't work when key is off.
If you have them direct wired, that should be OK. It's not the way it's done.
Going to disagree with you. I want the four way flashers to work with the ignition off, so I wired them to BAT. I don't want to leave the truck at the side of the road with then ignition on. Some factory systems have the four ways separate from the turn signals, but that's not the case with these aftermarket switches.
