How do I make a sprite vanish and disable, but then come back?

I know this is simple, but I can't seem to think through it.

I have an electrical field sprite. I need the sprite to be visible for 3 seconds-ish and then vanish and disable collision for 3 seconds then start over, visible for 3 seconds ..... around and around like that throughout the game.

I got the hard part done. If the player touches the electrical field sprite they lose a life and the level starts over, but I can't figure out how to get the field sprite to vanish and disable every 3 seconds.

Thoughts?

create a boolean(eFieldOn for example)

-every 3 seconds toggle boolean eFieldOn

-If eFieldOn=true set visible and turn collision on.

-if eFieldOn=false set invisible and turn collision off

Oh THANK YOU!

I couldn't get my brain around that this morning.

Working great.

Thanks again.