wiring harness suggestions?

Just fried some wiring going down the highway, from the firewall to an inline fuse that kills at least the lights and starter, looks like something is shorted when i try to put a patch piece of wire it blows apart...this is a stock 73 swinger with a 318 in it, does anyone happen to know where the cheapest wiring harness can be found? I dont need all the fancy crap, OM would be just fine with me but i dont want an old used one and I'm havin a hell of a time trying to find a basic affordable one. Any suggestions?