Sorry if it's been asked before, but can anyone tell me what the red/orange wire connector coming from the radio is supposed to be used for? Mine is not connected to anything. Car is a '72 340 Duster. Thanks!
The red is switched power to the radio from the accessory circuit in the ignition switch and through the fuse panel
The orange is cluster dimmer controlled for the dial lamp
at the bottom of the column near the firewall V shaped connector - it is the console wiring connector a sub harness plugs into it and runs to the right kick panel where the console wiring harness plugs into it. Orange wire is still dimmer controlled for PRND21 light as 67dart said.