HOISTMAN BROUGHT MEN TO SURFACE & STARTED TO LOWER MAN CAGE BACK DOWN THE SHAFT & COULD ONLY RAISE IT. ELECTRICIANS WERE CALLED IN & CHECKED THE LOWER CONTACTOR & FOUND A LOOSE WIRE & REPAIRED IT. MSHA WAS CALLED @ 2:40 A.M. & TOLD HOIST WAS OUT OF SERVICE. AFTER REPAIRS, MSHA WAS CALLED @ 4:40 A.M. & TOLD HOIST WAS BACK IN SERVICE.