making wiring harness from scratch

OK,
Its starting to get cool here in Austin, so Im lining up inside tasks for the build. One of those is to build a wiring harness from scratch. I have the wire in a 15' piece of elevator traveler cable.The cable has about 50 pieces of 20ga wire all with a different color code and striping.
What I need is a source for the bits to make the connectors to say the lights, and other factory connector ends.
Andrew