GM LS 24x PNP Harness

MS3Pro EVO+ 24x LS Plug and Play Harness (Harness Only)

Premium plug-and-play harness solution for GM LS engines with 24x crank triggers.

This listing includes the harness only, specifically designed for use with the MS3Pro EVO+ ECU. It supports plug-and-play installation on GM LS-based engines equipped with a 58x crankshaft trigger—no custom wiring or pinouts needed.

The MS3Pro EVO+ LS 24x Plug and Play Harness sets the standard for quality and value in the LS swap world. Whether you're working on a street car, race car, or custom build, this harness gets you up and running fast—with full support for the advanced capabilities of the MS3Pro system.

Key Features:

• Plug-and-play for 24x GM LS engines using MS3Pro EVO+

• Choose your injector connector type from the dropdown menu

• Built with TechFlex-wrapped, high-temp TXL and GXL automotive-grade wire

• Uses OEM-quality Delphi and TE connectors

• 4-gauge power and 10-gauge ground leads—suitable for front or rear battery locations

• Includes waterproof fuse and relay box with support for high-output fuel pumps (10ga, 30A circuit)

• All MS3Pro I/O is accessible for future expansion: traction control, flex fuel, bump box, table switching, and more

• Designed for a clean, show-quality appearance with professional-grade finish

This harness also supports optional automatic transmission control via the MicroSquirt transmission controller (sold separately). Just add the proper sub-harness for 4L60E or 4L80E, plug it in, and you're ready for full trans control.

Required Connections:

• Constant Power

• Constant Ground

• Switched Power

• Starter Signal

• Alternator Light

Recommended Connections:

• Fuel Pump Power

• Tachometer Signal

Note: This harness is designed for high-mount alternator configurations, such as Corvette and truck accessory drives. If you’re using low-mount alternators (Camaro, Firebird, CTS-V, GTO, or aftermarket brackets), you’ll need our Alternator Extension Harness for proper reach.