[FlashBox5]

Now do you need a whole new harness or can u pop off the plastic wiring cap from your 03, Disconnect those wires then plug the wires from the 05's in the 03 cap?

 

[nOTricKz]

I bought the harness on this forum. was some $30 or so. i'm sure you can rewire too, but the hassle would be more than worth IMO.