B737 Southwest Livery: Recognition Light Stays On

I've installed all of the SWA liveries for the 737 series, and since they have a lot of 737-700 routes that is what I fly. All exterior lights work off of the appropriate overhead panel switch except for the vertical stabilizer lighting (the brand recognition light).I've noticed in my real world flying that they don't seem to leave it on all the time. I assume it gets turned off with the other stuff above 10,000 or whatever.The PMDG liveries lightup the tail at night regardless of the switch position.Does anyone know how to turn it off or fix the problem?Thank you,