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In my experience, solder gives way or flows under pressure so that screw or clamp terminals don't stay tight. It's better to put a ring or fork or ferrule terminal on the wire, as appropriate. If that's not practical, then just solder the very tip of the wire to prevent fraying.
there's a bunch of potential reasons for linking the radio into the vehicle bus. discouraging aftermarket stereos, theft protection, knowing when the headlights are on, different eq profiles for different models or perhaps according to speed or window or convertible top position. I'd guess this stuff started happening in the mid-'90s. radios from the '80s would be safe bets, and not so old that wrecking yards would call them collectible.
Some late model car radios aren't usable unless they're connected to the car's computer bus. I don't know when that became a thing. They do it because it simplifies connections to steering wheel controls, and because a radio can automatically use different EQ curves for different vehicle models, and stuff.
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