Just a note to add: I installed my mirror and I had a problem with my ringer in my truck. Since you are using the relays to act like the headlight switch, if your mirrors are set on a delay to turn off your lights when you open the door you get that ringing sound when you leave your headlights on. You can always set the delay as low as possible on the slider on the mirror to turn off as soon as you turn the key off, BUUUUUTT a common problem with those mirrors is that the slider goes bad.....so you still might have a delay.
If you have power locks from factory you can just wire up one relay for the main lights and run that white/purple wire to your factory park lamps relay wire. You have to do some more cutting and splicing for a non powered locks, since you don't have this relay.
I just replaced my dash harness with a power door one so when I reinstall it I'm gonna probably wire it up to the factory relay for the park lamps.
Good choice picking that 2000 4cyl lol.
Quality Engineer (Electronics) for Kia Motors
University of Tennessee Electrical Engineering Graduate
2000 XLT 2.5L A/T