I have the wiring diagram that is available on the Czech Sport Cruiser website. I have the Garmin GNC255A installed. You said I need to find out whether it is the wiring or the radio. What's the best way do diagnose that? I am still quite new with dealing with electrical issues so I apologize for any questions that would seem obvious to others.
I think that you are probably at the point where you need some test tools and some expertise. You may need to find someone who can help you. It is likely that things will have to start being disassembled to access the wiring. It is difficult to advise further I'm afraid.
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