hooked the battery back up after three days of being unhooked and tried to start it and nothing happens?

So, I hit a deer on the way home the other evening and broke the bumper grille and headlight and the plastic on the radiator. So, I replaced all that and got it all squared away and found a plug that goes to an impact sensor. When I hooked the battery back up after three days of being unhooked and tried to start it nothing happened other than the dome light coming on. nothing else comes on; no horn, headlight, or anything. I have checked the fuses and they all seem to be good. Please help.