Rywire Honda B-Series Mil-Spec Engine Harness w/Chassis Specific Adapter

If you're swapping a B-series or D-series engine into your 1988-1991 Honda Civic/CRX (EF chassis, DX/late model), getting the wiring sorted is a critical step. This Mil-Spec engine harness from Rywire is built to make that process as straightforward as possible, handling all the engine's electrical needs with a chassis-specific adapter that's designed to plug right in.

Rywire is well-known for making high-quality wiring solutions for engine swaps, and this harness is no exception. It uses Mil-Spec connectors and high-strand-count wire, which is a step up from standard automotive wire. This means it's built to handle vibration and temperature changes reliably over the long haul. The harness is laid out to route cleanly through your engine bay, and the included adapter means you won't be cutting and splicing into your factory chassis harness. It covers all the essential engine functions, including fuel injectors, ignition coil, oil pressure, water temp, and ECU connections, ensuring your swapped engine runs smoothly and correctly.

This harness is designed for the specific needs of the EF chassis, DX or late model variants, so it's important to confirm your chassis type. It's a well-built component that takes a lot of the guesswork out of a complex engine swap. You'll want to have your factory service manual handy for reference during installation, but this harness simplifies the engine-side connections significantly.