Switched 12-volt source at Denali fuse box

Can someone tell me which wire I need to tap to get switched (ignition/engine running) 12-volt power from a 2004 Denali fuse box? I want to permanently install a V1 radar detector.

Thanks in advance.

JAdelus

Nobody has any information on this?

Best thing to do is use a test light to find your power source....check the junction box on the firewall left of the brake pedal.

hey im have a uniden radar pro installed i ran a wire to the radio fuse on right side and neg to ground every time ign is turned radar pro turnes on!