I'm trying to hardwire my Passport 8500 and being an electrical idiot, I need help. I'm trying to use a tap connector (http://www.posi-lock.com/posiplug.html) and I don't know what wire to tap. If I use the rear brake light switch, do I just tap the orange wire? Is there a better wire (such as tailight) that I should use? Also, can I just attach the ground wire to the negative battery terminal? I considered a fuse box relay and ground block, but this is all the electrical stuff I'm doing so that would be overkill. Thanks for the help.