How do I find the short in my wire harnes

I had my radio direct wire to the fuse plug and while driven I hit a bump and the wire shorted out. Now I cant find where the short is, out of the wires for the fuse box I only have the interior opptions, lihgts power windows power seats and doors. But I have no power to the ignition, wipers, signal lights.I just replaced the ignition relay, and starter relay, and I still have no power to the ignition switch