Multitexturing Issue

Well I want to multitexture my terrain with a simple terrain texture and also add a detail textured map so it feels much better. I can easily manage to draw both the texture using the textureunitstates, the detailed one as the first texture with mode: COMBINE and the second one, the terrain texture, with mode: MODULATE. But the problem now is that my terrain looks really really dark and can’t seam to find a solution to this. I already tried to work with the materials, coloringattributes and also normals on my terrain and use lighting but nothing seams to change … in the end I want to have a terrain that kinda looks like the one in the Hightmapping tutorials on www.gametutorials.com

any help would be much appreciated !