I'm working on EleeGS's car and his is a hybrid so it puts the battery in the back. Did you guys extend the wires to the trunk or is there a extension for the battery already?

 

^ not sure what my installer did, so i can't answer that question. but it might be easier (from an install perspective) to just run the wires to the trunk. if anything goes wrong, you know its not your wiring. btw, replied to your pm.