It is nearly impossible to remotely diagnose this problem without wiring
diagrams,
photos of the install, etc. Generically, grounding is a possibility.
So, did you check all the resistance values of ground pins on the radio
and the case all the way back to the engine block or negative battery
terminal with a quality ohm meter? All should certainly be less than 0.5
ohms. Generically, there should be no ground loops, all grounds go to
a single point in the panel, then to the other side of the firewall.
Good luck!
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Ira N224XS
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