Haltech Alternator Pigtail - LS Harness Alternator Adapter - Small -GM Alternators

Overview

The Haltech LS Harness Alternator Pigtail adapter eliminates wiring headaches when running GM Delco or Bosch alternators with your LS engine management setup. This essential connector bridges the gap between your Haltech engine harness and small-case GM alternators, ensuring proper charging system integration without cutting or splicing original wiring.

Technical Specifications

• Part Number: HT-040090
• Connector Type: Small Bosch 2-pin to Delco/Bosch GM alternator
• Application: GM Delco and Bosch alternators (small case)
• Cable Length: Compact pigtail design
• Construction: OEM-grade terminals and weatherproof housing

Why You Need This

LS swaps and engine conversions often hit a snag at the charging system. GM alternators use different connector pinouts than many aftermarket engine harnesses, leading to bodged connections, voltage regulation issues, or complete charging failure. This adapter solves that problem properly — no more twisted wires under heat shrink or dodgy crimp connections that fail when you need them most. Whether you're dropping an LS into a classic chassis, building a boosted LS setup, or converting from carburetor to EFI, maintaining proper alternator communication is critical for system reliability.

The small connector variant suits compact GM alternators commonly found on LS1, LS2, and many aftermarket high-output units. We've seen countless builds where cheap universal adapters cause intermittent charging, dashboard warning lights, or worse — battery drain that leaves you stranded. Haltech's purpose-built pigtail uses the correct terminal types and wire gauges to handle full alternator output without voltage drop or connection failures.

ECU & System Compatibility

Designed specifically for Haltech LS engine harnesses, this adapter integrates seamlessly with Elite 550, Elite 750, Elite 1000, Elite 1500, Elite 2000, and Elite 2500 ECUs running LS configurations. Also compatible with Nexus R3 and R5 systems when using LS-specific harness configurations. The adapter handles alternator field control and sense functions essential for proper charging system operation with Haltech engine management.

What's in the Box

• Haltech alternator pigtail adapter with small Bosch 2-pin connector
• Pre-terminated Delco/Bosch GM alternator connector
• Installation documentation

Complete Your Build

Most customers building LS swaps also require our comprehensive Haltech LS engine harness kits and ECU packages. Our technical team can recommend the complete charging system components for your specific build, including alternator upgrade options and battery relocation hardware. With UK stock held at Billy's Speed Shop and expert pre-sales guidance from tuners who've completed hundreds of LS conversions, we'll ensure your charging system integration is bulletproof from day one.