Ford Explorer exterior light problem

Good afternoon, I have a problem with the daytime running lights in my Ford Explorer Truck year 1993, when I turn on them normal this will pass about 15 minutes begins to turn on and to turn off. He changes the swich and reluctance to light the lights and continue the problem.

and where I can look for the owner manual of this vehicle.

They only do the lights or also the instrument box?

Three things or the light of light on, the light change switch, or the cable from the usable to the successful success, check and notify me

Only the lights

My mom has an equal explorer and also had the same problem eu a small trip that she did and bridged her a kind of fuse or relay.