bmussatti,
From the PCA Tech Q&A :
"There is actually a cutout on the bottom of the drivers door for the wiring for the trickle charger to go thru."
http://www.pca.org/tech/tech_qa_question.asp?id={80AA6398-4F9E-454F-9AA2-DEA111D68660}
I went in the garage and took a picture with my cell phone. It looks like both the driver and passenger door have the cutout ( see pic ).
I read this in the owner's manual.
Not sure you have this on the 2006 ( I have a 1999 ).
Hope this helps...
Nick