I have used the main power feed that is on the inside of the car. There are 2 main cables that go to a connector. This can be found if you open your glove box, then take off the little panel to the left. In there is a fuse panel, and below and to the right are two large cables in a connector I think Blue & white from memory, with a yellow catch. I hope this helps. Unless the power draw is excessively high, these should be sufficient.