hi. i just bot a 2007 Silverado 2500 HD i have a valentine radar. seems like all the dc outlets /plugs in the vehicle are all full-time on. they arent switched so they dont shut down when the truck is turned off so i'm a bit concerned about unnecessary drain on the batter. i have a valentine radar and have a hardwire kit. i need to clamp onto hot and grounded wires that are switched. i was thinking there MUST be something in the overhead/rearview mirror/homelink garage door opener area. anyone have any ideas? diragrams? schematics, etc. how do i access that area?