I could use some help on nav lighting Please?

I am trying to modify a plane which has no "lights" in rhe aircraft.cfg file. When I add some lights in the cfg file the aircrafts own lights seem to turn on first then off, then the aircraft.cfg lights go on and this seems to interfere with the smoke system. There is smoke in the cfg but no smoke with the I key. Can anyone help me? Where is the info on the aircrafts own light stored?Thanks in advance.