Haltech Elite 550 / 750 Plug & Play Adapter Harness – Honda OBD1 B / D / H Series

VTI StreetSpec Haltech Elite 550 / 750 Adapter Harness

Engineered for direct standalone conversion on Honda OBD1 platforms, this adapter harness allows installation of a Haltech Elite 550 or 750 ECU using your factory B-Series, D-Series, or H-Series engine harness — with zero splicing required.

Designed for clean integration and reliable signal integrity, this harness maintains OEM sensor functionality while expanding standalone capability.

Platform Compatibility

• Honda OBD1 B-Series
• Honda OBD1 D-Series
• Honda OBD1 H-Series
• Compatible with factory distributor (VR pickup supported)
• Designed for Haltech Elite 550 and Elite 750 ECUs

Full Sensor Integration

Retains OEM engine sensors and distributor configuration while properly routing VR pickup signals for standalone control. No repinning of factory harness required.

Pre-Wired Outputs

• VTEC Output
• Boost Control Solenoid Output
• A/C Control Output

All pre-terminated and ready for activation within Haltech software.

Expandable Output Provision

Additional output terminals included for:

• Coil-On-Plug conversion
• Auxiliary outputs
• Future expansion

Designed with upgrade flexibility in mind.

Integrated Relay & Fuse System

• Built-in main relay
• Integrated fuse protection
• LED relay indicator for quick diagnostics

Streamlined for clean installation and simplified troubleshooting.

Construction Standard

• TXL automotive-grade wiring
• Properly terminated and labeled
• CarrotTopTuning branded construction
• Clean StreetSpec routing and loom finish

Built for reliable street and performance applications.

Installation Support

Includes pinout overview sheet for guided installation and configuration reference.

Why VTI StreetSpec?

StreetSpec harnesses are engineered for clean OEM+ integration with structured routing and reliable standalone compatibility — without the complexity of full motorsport-spec construction.

Designed for performance builds that demand quality and expandability without overbuilding.