Yeah, you material setup is...unique. I would suggest deleting that material and re mapping it to the lightbar. Typically your material setup will be ordered something like:
Lightglass name.png
vehicle_genericmud_car.png
vehicle_generic_smallspecmap.png
vehicleenvmap128.png
and there is not normally any need for other textures to be in the material
It can get confusing setting up materials. Did it not have that material automatically made when you imported the textures into Zmodeler?