I took submariner's advice and bought a wired FM transmitter/modulator. Now I need to get the thing hooked up, the antenna hookup is easy and so is the ground, but I don't know where to get power from. Can I use the RCU itself somehow? Can I clip a wire in that area and connect the unit? My car is a 2004 Sable LS with the Mach system and the automatic climate controls.