I have a hard wire kit for mobile operation, which shipped with my scanner. There are three wires, red (pwr), black (grd) and orange (???). I need to know where to connect the orange wire? Thank you for the advice.
5. Before inserting the scanner in the sleeve, attach the cable from the previously
mounted antenna. Attach the DC Power leads. RED goes to a positive (+)
connection on your fuse block while BLACK connects to the vehicle’s chassis
6. Connect the ORANGE lead to one side of the headlamp switch so that when
you activate the headlights, the scanners LCD backlight dimmer level changes
color and intensity. Be sure all the connections are routed away from any
potentially pinching or slicing sheet metal.
I couldn't find the info for the XT though. Sorry. I would guess (but not guarantee) that the install would be the same.
Just a suggestion ... forget about the 3-wire connector and use the standard coaxial one. The display intensity is easily changed anytime you want by pressing the volume button on the front keypad. It has four levels - off, dim, medium, & bright. I find you can "custom" set it much easier without the "automatic" dimming when your headlights are on. (Sometimes it's safer to drive with the headlights on in the daytime, etc.)