Haltech Nexus S3 Plug-and-Play Wiring Harness

The Boomslang BF29045-S3 is a vehicle-specific, plug-and-play (PNP) wiring harness engineered to seamlessly integrate Haltech Nexus S3 ECUs into your performance build. This preserves the original harness, enhances serviceability, and ensures reliable results for race teams, tuners, and dedicated performance enthusiasts. This harness is compatible with Haltech Nexus R3, R5, S2, S3, and Rebel LS configurations. It enables full engine control directly from the ECU. For select platforms, the factory ECU can remain connected in parallel, providing support for OEM CAN bus communication or automatic transmission control. Note that certain BMW, Dodge, 1996+ Ford, Hyundai, and Kia applications may require Haltech coil drivers to be plugged into the harness for proper ignition output. All Boomslang Fabrication LLC products are designed and manufactured in the USA. They are intended solely for vehicles used in sanctioned competition and may not be used on public roads or highways unless a specific regulatory exemption is permitted. It is the installer's and user's responsibility to ensure compliance with all applicable laws and regulations. Boomslang Fabrication LLC is not liable for any labor charges or incidental/consequential damages. This harness carries a one-year warranty from the date of purchase, and all sales are final as harnesses are built to order.