[Germanjap]

Thanks for all the useful info! i just finished hardwiring my radar detector for my FR-S. VERY easy to do because of all the postings. Bought red the T-Tap connectors (telephone-tap connectors) for 18-22 gauge wiring from Radio Shack and used the t-taps to connect to the wires of the extra harness found above the map-light. Black was ground and White (looked more like grey) for +. Used the hard wire kit with built-in fuse I had ordered from my radar detector's web site. Threaded the wiring between the headliner and windshield with my fingers and connected to the radar connector. I found the hardest part was finding the extra harness itself (Found it reaching past the bluetooth mic secured with blue tape enveloped in grey foam). Disconnecting the map-light made it less cumbersome. It only took 5-10 minutes to complete. Thanks again to everyone for posting how to do this!

update: It's been over 2 years since the install and no problems with the t-tap connectors whatsoever.