This setup may not justify more explanation since it's hacky but effective. To eliminate the parasitic drain from the accessories you can use two of these Connect one end to the negative battery terminal and all the accessories to the other terminal. Set the wiring so the pigtail is easily accessible by the seat. To complete the circuit plug in the mating pig tail that you've shorted out (dongle). Pull the dongle at night and plug it in during the day. Like I said it's a hack (-5 points) but effective. Personally, I just pull the GPS from the cradle.