Those yellow wires lead to a switch someone added so they can flash without getting down and plugging/unplugging things.
Find the switch and flick it. Flash. Unflick.
That is, with the connectors always connected, of course.
Or, if you don't find a switch, there are failsafes that use those connectors... like some WI systems.
But, yes. If no convenience switch nor WI failsafe installed, then remove both yellow wires, put the red one back in place and insulate the wires, and use normally.