If things are at all similar to the ZR3, this is how the wiring goes, in terms of ZR3/4 integration:
http://www.escortradar.com/pdf/Shift...stallGuide.pdf
The ZR3/4 is the powered unit, with the "Interface" box (Component F) being the one that's wired to the chosen power/ground source.
The optional "link" cable (Component G) is then used to power the detector, connecting the Interface to the detector. The detector's SmartCord is eliminated from the circuit, completely.
The ZR3/4's enclosed slim-line "Remote Mute Button" is then used to control both the stand-alone in-car 9500i as well as the stand-alone ZR3/4, now "linked" to the detector.
This is an old picture of mine (please excuse the displaced shift-boot as well as auxiliary gauge, this was a "during install" pic), which clearly shows the ZR3's slimline mute, surface-mounted just below my left/driver's side HVAC control knob:
Below is my setup before integration, where I ran the x50 and ZR3 separately:
Here, you can see the x50's SmartCord, mounted adjacent to the ZR3's separate Remote Mute/mode-control button.
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