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nissan radios and aftermarket radios ground thru the ISO brackets that they mount into. the black ground wire for the radio should be bolted to the iso bracket or a suitable chassis ground behind the dash. none of this "grounding thru the antenna" bullshit. and check your fuses, dont run some wire to the battery. makes NO sense. fix the problem, not create more potential problems.
how did you check fuses? multimeter with continuity? with nissan's whack-ass wiring, when certain fuses blow, they still read continuity and "meter" ok... but if you pull the fuse out, its blown. also, dont just check for "audio" related fuses... again, nissan did some whack wiring and very much like nissan_driver24 said, it could be a seemingly unrelated fuse that is your problem.
i do this shit for a living so im not sitting here talking out of my ass. hope this helps
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