1990 Mazda Miata OE Wiring Harnesses & Stereo Adapters Mazda Miata 1990, 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.. mazda miata wiring harness | eBay Find great deals on eBay for mazda miata wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. 1990 1991 MAZDA MIATA REAR WIRING HARNESS FUEL PUMP TRUNK LIGHTS NON-ABS (Fits: Mazda Miata) Pre-Owned. $40. Buy It Now +$10 shipping.