I have done several, but it's been a while since anyone needed a radio. I am putting a new Kenwood into a 4 door B13. I am reusing the factory harness. I can splice well. I just do not remember what color to what colors. I want to make this seamless as it may snow soon. Anyone rmemeber off the top of have a thread on it? Thanks. We don't want to make a second trip to look for a harness connector.
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Ian, here you go: B13 Radio Harness (http://www.installdr.com/Harnesses/Nissan-Wiring.pdf).

Yeah, I printed out the pdf and did it in like 20 minutes. We just need an antenna adapter. He had no radio, just aux and cd. Also the rear speakers need to be hooked up. For some reason we got no rear audio at all.