Hello! I will assume you are connecting a factory radio for your 1993 Shadow.
Remove the Orange wire from ground...Listed below is wiring from car to radio; You may need this one day...You are correct; There isn't a dimmer wire...The Orange wire, from the radio, connects to the Orange/White of the vehicle...Grounding the Orange wire is causing your problem...
1993 Shadow...Orange/ White=Illumination...Red=Hot at all times...Red/White=Switched 12volts...Black=Ground
Factory radio...Orange=Illumination...Pink=Hot at all times... Red/White=Switched 12volts...Black=Gnd.
Car; Orange/White to Orange of radio
Red To Pink
Red/White To Red/White
Black To Black
Let me know how you make out..
Guru...............saailer
I’m happy to help further over the phone at
https://www.6ya.com/expert/david_6df67de3b14de867
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