Supra Wiring Harness | eBay GENUINE 1988 - 1992 Toyota Supra FRONT RIGHT PASSENGER. 1988 TOYOTA SUPRA 3. SIDE Door Wiring Harness OEM. WIRING IS NOT CUT, ITS ALL CONNECTED. Make sure to inspect the item thoroughly in the pict.. Wiring Harnesses and Looms - Toyota Supra Performance This listing is for a brand new 1JZGTE engine harness swap into the 86.5-92 MkIII Supra. These wiring harnesses are built using new wire, new OEM terminals, and new OEM connector housings. Designed for use with the JDM ECU (High impedance injectors, MAP and IAT sensor, no MAF wiring).