You need to look at the panel folder for the aircraft and make sure it has entries that look like these
file_1024_night=737-800_panel_background_night.bmp You have to have the .bmp file or no lights.
and this is from the panel cfg file
[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing 6=taxi, 7=recognition, 8=wing, 9=logo
light.0 = 1, -35.100, 0.600, 19.100, fx_shockwave_beaconh_l ,
light.1 = 1, -83.500, 0.600, -7.080, fx_shockwave_beacon_rotating_red ,
light.2 = 3, -219.700, -0.250, 12.200, Opensky_nav_yellow ,
light.3 = 3, -219.700, 0.250, 12.200, Opensky_nav_yellow ,
light.4 = 2, -218.900, 0.000, 11.350, fx_strobeh ,
light.5 = 3, 32.500, 0.000, 14.850, fx_shockwave_vclight_l ,
light.6 = 9, -208.500, -4.500, 43.750, Opensky_wing_light , // <-----3 previously
light.7 = 9, -208.500, 4.500, 43.750, Opensky_wing_light , // <-----3 previously
light.8= 5, -79.700, -29.200, -2.000, Opensky_nacelle_refl ,
light.9= 5, -79.700, 29.200, -2.000, Opensky_nacelle_refl ,
light.10= 5, -46.500, -11.700, 0.000, Opensky_nacelle_refl ,
light.11= 5, -46.500, 11.700, 0.000, Opensky_nacelle_refl ,
light.12= 5, -40.500, -13.700, 1.900, Opensky_nacelle_refl ,
light.13= 5, -40.500, 13.700, 1.900, Opensky_nacelle_refl ,
light.14= 5, -14.333, 0.000, -2.000, Opensky_nacelle_refl ,
light.15= 3, -18.300, -6.500, 6.000, Opensky_nacelle_refl ,
light.16= 3, -52.610, -4.500, 6.000, Opensky_nacelle_refl ,
light.17= 3, -144.510, 0.000, -3.000, Opensky_wing_light ,
There is also a difference between daytime scenery and night time scenery
All night time scenery will have a _L at the end of the name
I remember when I created a line shack I had to make both daytime and night time textures.