Having trouble with model textures.

So recently I've been trying to make a Sonic the hedgehog thingy so I went on models resource and downloaded the .dae file for classic Sonic in Sonic generations. I imported the textures into unity, then I put in the model. The materials had the textures and materials were correctly allocated to parts of the model but the whole thing was pitch black! I tried playing with the ambient colour a bit and making it white helped a tiny bit but it still looks dark and messed up. Any tips or help? Has anybody else run into this issue?