This is the lights section from the stock C182:
[LIGHTS]
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit
light.0 = 3, -3.03, -18.11, 3.58, fx_navred
light.1 = 3, -3.03, 18.11, 3.58, fx_navgre
light.2 = 3, -21.45, 0.00, 1.95, fx_navwhi
light.3 = 2, -3.33, -18.31, 3.58, fx_strobe
light.4 = 2, -3.33, 18.31, 3.58, fx_strobe
light.5 = 1, -21.52, 0.00, 7.40, fx_beacon
light.6 = 4, -2.24, 0.00, 2.20, fx_vclight
The parts of each line highlighted in red are the effect files called by each line, for instance, the effect fx_navred.fx. The first three lines are the nav light effects. Try subbing them into your config - if everything else is right, you should have working nav lights.
Oh, and make sure that the parts highlighted in blue are 3's to tell the sim which switch they should work with.