Ditto on the above

Here's the answer:
JEGS Performance Products 10560: Electric Fan Wiring Harness & Relay Kit | JEGS

I can make this up in my garage for about ten bucks, but I have a stash of #10 wire and a bunch of relays. Buy the kit and everything you need is there. Well spent $35.

Click on the instruction tab and there's a nice picture.
Glenn