This is on my 2004.
Grab a piece of wire you have laying around somewhere. Use a gauge equal or heavier than the wires you're going to be working with. In the photo, you can see the heavy white wire I used. A 10" length will be fine. Strip an inch or two of the sheath off each end.
There are 3 wires that go to the turn signal bulb - black, brown, and striped. Leave the black/brown wires alone. (The color of the striped wire may vary from driver to passenger side and from one model year to another, but that's irrelevant)
Strip back some of the sheath on the striped wire. You do not actually cut this wire, you're simply going to be branching another wire off it. Twist the end of your new piece of wire around the exposed area of striped wire. (
A)
The side marker has 2 wires, brown and black. Leave the brown wire alone. Cut the black wire a few inches from the bulb socket, and strip back some of the sheath on the end that goes to the bulb. Twist the other end of your new piece of wire to it. (
B)
Test the lights. The turn signal and side marker will blink together with the parklamps/headlamps off, and will alternate with the parklamps/headlamps on.
Use electrical tape to tape up the wires. For the long end of the black wire that went to the side marker, tape off the end and tuck it somewhere out of the way. This wire does nothing anymore. (
C)
You can use wire taps or solder the wires, but I've never had any issues with the twist-and-tape method on any vehicle I've done this on.