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MS3Pro Plug and Play Drop-on Engine Harnesses

EPA, CARB, Race Use Only Disclaimer

Available in 24x and 58x versions, The MS3Pro Plug and Play Drop On Harnesses are professionally engineered and easy to install. Fire up your engine on day one! All wiring is composed of TechFlex woven, self-extinguishing wrapped hi-temp TXL & GXL automotive grade wire with OEM Delphi & TE connectors. Reach the battery under the hood or in the trunk with 4 gauge power & 10 gauge ground wires. All relays and fusing live in a single, waterproof fusebox and the fuel pump wiring / relay / fusing is big enough for pumps that can handle 1000whp or more right out of the box (10ga wire, 30amp circuit). Additionally, all of the available I/O of the MS3Pro are brought out in the harness to make expansion as easy as possible regardless of the featureset you’re planning to use, allowing for killer features like traction control, bump box, table switching, flex fuel, and more. This harness was designed with room to grow! And did we mention it’s show-quality-drop-dead-gorgeous?

This harness also is designed for optional automatic transmission control using our AMP EFI transmission controller (sold separately). Literally just plug in our transmission controller using the proper sub-harness (for 4L60E or 4L80E) and you’re ready to control your trans!

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  • MS3Pro 24x LS Plug and Play Harness w/ ECU-EVO

    From: $1,749.00

    This COMPLETE package includes an MS3Pro EVO ECU, a 24X EVO/ ULTIMATE/ Drop On Harness  Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pro Ul...

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  • MS3Pro 58x LS Plug and Play Harness w/ ECU-EVO

    From: $1,749.00

    This COMPLETE package includes an MS3Pro EVO ECU and 58X EVO/ ULTIMATE Drop On Harness Experience the MS3Pro EVO. MS3Pro EVO is an evolution, not a revolution- a scaled up, more capable MS3Pro due to shared technology with big brother, MS3Pro Ult...

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  • MS3Pro 24x LS Plug and Play Harness w/ ECU-ULTIMATE

    From: $2,049.00

    This COMPLETE package includes an MS3Pro ULTIMATE ECU, a 24X ULTIMATE specific Drop On Harness & black center expanded I/O pigtail. Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability...

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  • MS3Pro Plug and Play GM LS Alternator Lead Extension Harness

    $24.99

    30" extension for GM LSx alternator subharness.  Our harness will require this if used with Camaro, Firebird, GTO, or CTS-V accessory drives. You can also use this with aftermarket brackets that move the alternator to a low mount position or relocate it ...

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  • MS3Pro 58x LS Plug and Play Harness w/ ECU-ULTIMATE

    From: $2,049.00

    This COMPLETE package includes an MS3Pro ULTIMATE ECU, a 58X ULTIMATE specific Drop On Harness & black center expanded I/O pigtail. Experience the ULTIMATE. Developed from the MS3Pro 1st Gen platform, the Ultimate brings NEXT LEVEL capability...

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  • GM LS 24x Plug and Play Engine Harness – ULTIMATE EVO

    From: $799.00

    Designed for MS3Pro ULTIMATE plug and play installation.  HARNESS ONLY in this listing The MS3Pro 24x LS Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today.  Save your hard earned time and money while...

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  • GM LS 58x Plug and Play Engine Harness-ULTIMATE EVO

    From: $799.00

    For MS3Pro ULTIMATE/ EVO plug and play installation on GM LS engines with a 58x crank trigger. The MS3Pro 58x LS Plug and Play Harness is the highest quality, best value option for LS Motors in the industry today.  Save your hard earned time and money...

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  • AMPEFI Transmission Controller with 4L80E Subharness

    $499.00

    4L80E Plug and Play Transmission Control  Seamlessly control your 4L80E transmission with AMPEFI Transmission Control! The supplied 4L80E subharness provides a simple, plug and play integration with MS3Pro and directly mates with our LSx drop on ha...

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  • AMPEFI Transmission Controller with 4L60E Subharness

    $499.00

    AMPEFI 4L60E Plug and Play Transmission Control Seamlessly control your 4L60E transmission with AMPEFI Transmission Control! The supplied 4L60E subharness provides a simple, plug and play integration with MS3Pro and directly mates with our LSx drop ...

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  • MS3Pro 1st Gen Wiring Harness Upgrade (for ULTIMATE & EVO)

    $22.00

    If you have a previously installed MS3Pro harness (1st Gen) and want to change to an MS3Pro ULTIMATE or EVO ECU, the upgrade path is simple.  However, complete functionality will require a few basic changes to your 1st Gen harness. Our wiring upgrade ki...

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