prelude engine harness | eBay Find great deals on eBay for prelude engine harness. Shop with confidence. Skip to main content. eBay Logo: 90-91 Honda Prelude OEM engine motor wiring harness loom factory Si A/T B21A1 See more like this. 90-91 Honda Prelude B20A5 Engine Motor Wiring Harness M/T - Used Engine Wiring Harnesses for the Honda Prelude Used Engine Wiring Harnesses for the Honda Prelude for Sale. Get a great deal! Our used auto parts locator service will help you get a great deal on the used Honda Prelude engine wiring harnesses you need for your car, truck, SUV or van.