ummm.........what I did was I pulled out my side marker lights.
There are 3 wires that go to it. I took a test light and started turning on and off the parking lights until the test light lit up and just wire it up to it.

I think its the middle one... but get a test light or you could just hook it up to positive. but I did it this way because i tend to leave my lights on and once I set the alarm the lights stay on for like 15 seconds and then automatically shut off.