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

The straightforward way to run a Haltech Elite 550 or 750 on your Honda OBD1 build — without splicing your factory harness. This adapter is engineered for direct standalone conversion on Honda OBD1 B-Series, D-Series, and H-Series platforms, maintaining full OEM sensor functionality while expanding standalone capability from day one.

No splicing. No repinning. Clean integration.

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

What's Built In

Pre-Wired Outputs

• VTEC Output — ready for activation in Haltech software
• Boost Control Solenoid Output
• A/C Control Output

Expandable Output Provision

• Coil-on-plug conversion terminals
• Auxiliary outputs
• Future expansion capability

Integrated Relay & Fuse System

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

Construction Standard

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

Includes pinout overview sheet for guided installation and configuration reference.

Why VTI StreetSpec?

StreetSpec harnesses deliver clean OEM+ integration with structured routing and reliable standalone compatibility — without the complexity or cost of full motorsport-spec construction. Built for performance builds that demand quality and expandability without overbuilding.