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Must be that you are using the old speaker wiring that is COMMON GROUND wired. Aftermarket Radio will not like that sort of wiring for speakers. You need to run new wires at least to the rear speakers or I would do all 4 just cause the wiring is old.

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11y ago
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Q: Fuse for dash lights blowing after installing aftermarket radio need suggestion or radio wiring diagram on 86 300zx?
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