1985 nissan 720 radio wiring? | Yahoo Answers Jan 08, 20121985 nissan 720 radio wiring? also cant get a wiring harness because the old am radio is smaller so the new one doesnt fit in factory location. and i have wired up sub and speakers and amp to the head unit all i need is to power it. preferably from the old Does anybody know where i can get a radio wiring diagram for a 1985 nissan pickup?Status: OpenAnswers: 3 1985 Nissan 300ZX OE Wiring Harnesses & Stereo Adapters Nissan 300ZX 1985, Aftermarket Radio Wiring Harness by American International®, with OEM Plug. American International Installer Preferred wire harnesses are a vital link between today’s mobile electronics and a given vehicle..