Wow, thanks. I've also been doing some searching myself:
www.danielsternlighting.com has a generic tutorial.
From Morris' link:
"Cut the ground wire for the parking light. [
What end should I cut? On the ground part or near the bulb?] Tape off the end that goes to the car cos you won't be using it anymore.
Splice the ground wire from the parking light (the bulb socket) to the 12V+ wire of the blinker. You'll need a piece of wire and some crimps to do this. [
Any particular gauge of wire you recommend?]
Parking lights off = parking light and blinker both blink at the same time
Parking lights on = parking light and blinker blink alternately.
Remember to cut the ground wire on the parking and only use the end that goes to the bulb socket of the parking light otherwise you'll end with blown fuses. Also verify the wires with a DMM before you cut and splice"