Hardwiring in a radar detector.

If you have a sunroof,

Prep-work:
• Get a female car adaptor jack (from Radio Shack)
  
  and cut the wires leaving only the female connector. Strip the 2 wires to reveal ~ 1/4" of wiring.

In the car:
• start by removing the clear plastic cover for the map lights. It swings down from nearest the windshield.
• Then remove the snap-in panel behind the sunroof dial.
• Remove the rear-view-mirror mini-sub-screen (1 screw)
• so you should be looking like this...
  
• The map light section is held in place by 2 screws... remove those.
• Disconnect the blue wiring harness. (shown dangling in other picture)
• Take the smaller/left-side end and open up the connector "door" with a small screwdriver to expose where the wires mate into the connector
  
  (this door swings out on a plastic hinge).
• The large red is +12V and large brown is GND.
• lay your wires from the car jack into that, snap shut. Solder these in if you wish, but with this part not being in constant motion, I found the pressure from the closed connector was enough to keep these wires in place for the 4 years I owned my 1st passat.
• Re-connect blue wiring harness.
• Use the power cord supplied with your detector.. and plug in to the new "cigarette jack" you have installed to test. Assuming it works...
• The the cord from the RD and pull the power jack (that goes to the RD) up over the map light section, and down behind the rear-view mirror.
• Pull all excess cord up into the sunroof area.
• Start by re-installing the rear-view-mirror subshade to hold this cord in place.
• Next reinstall the maplights.
• Now you should have just a short power lead for your RD, and all else hidden away up in the sunroof compartment.
• then tuck it all back up in the sunroof motor compartment
  
• I tucked the new 12V connector inside the grey fabric sleeve.