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    LMMF SIMPLIFIED WIRING

    • Home
    • All products
    • 3100/3400 Engine
    • 3800 Engine
    • LS
    • ECOTEC Engine
    • 2.2 GM
    • Toyota
    • Apparel
    • Contact
      • Return Policy
      • Contact Information
      • Terms of Service
      • Privacy Policy
    • FAQ
      • Troubleshooting and Helpful links
      • Install Guides
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    ALL PRODUCTS 3100-3400 ENGINE 3800 ENGINE ECOTEC ENGINE 2.2 (non ecotec) ENGINE TOYOTA ENGINE LS ENGINE APPAREL

    Featured products

    • “Party mode” temp sensor meltdown switch

      “Party mode” temp sensor meltdown switch

      “Party mode” temp sensor meltdown switch

      Regular price $120.00 USD
      Regular price Sale price $120.00 USD
      Unit price /  per 
    • Standard Switch box

      Standard Switch box

      Standard Switch box

      Regular price $175.00 USD
      Regular price Sale price $175.00 USD
      Unit price /  per 
    • Quick Disconnect switch box

      Quick Disconnect switch box

      Quick Disconnect switch box

      Regular price $225.00 USD
      Regular price Sale price $225.00 USD
      Unit price /  per 
    • Heavy duty spark plug wires

      Heavy duty spark plug wires

      Heavy duty spark plug wires

      Regular price $40.00 USD
      Regular price Sale price $40.00 USD
      Unit price /  per 
    • 96-2005 3100/3400 harness ecm bundle package

      96-2005 3100/3400 harness ecm bundle package

      96-2005 3100/3400 harness ecm bundle package

      Regular price $495.00 USD
      Regular price Sale price $495.00 USD
      Unit price /  per 
    • 89-99 3100 harness and ecm bundle

      89-99 3100 harness and ecm bundle

      89-99 3100 harness and ecm bundle

      Regular price $525.00 USD
      Regular price Sale price $525.00 USD
      Unit price /  per 
    • 98-01 Toyota Camry (99-03 solara)(99-2000 Sienna)(98-99 Avalon)(98 Lexus es300) Harness and modded ecu Bundle

      98-01 Toyota Camry (99-03 solara)(99-2000 Sienna)(98-99 Avalon)(98 Lexus es300) Harness and modded ecu Bundle

      98-01 Toyota Camry (99-03 solara)(99-2000 Sienna)(98-99 Avalon)(98 Lexus es300) Harness and modded ecu Bundle

      Regular price $285.00 USD
      Regular price Sale price $285.00 USD
      Unit price /  per 
    • 97-99 Camry Modded ECU & Harness Bundle

      97-99 Camry Modded ECU & Harness Bundle

      Sold out

      97-99 Camry Modded ECU & Harness Bundle

      Regular price $285.00 USD
      Regular price Sale price $285.00 USD
      Unit price /  per 
      Sold out
    View all

    Let customers speak for us

    from 22 reviews
    Always what you ask

    Always what you ask for

    Charles E Thompson
    08/11/2025
    Heavy duty spark plug wires
    Heavy duty spark plug wires
    Great customer service and tech support

    Great customer service and tech support, product works amazing and make the build a breeze!

    Nathan
    08/05/2025
    98+ 3100/3400 Tuned ECM
    98+ 3100/3400 Tuned ECM
    Great experience!

    I bought a tuned ecu and simplified harness, both arrived quickly and the quality of the harness is top notch! Can’t wait to get them in a car and see how it preforms!!

    Brock
    08/04/2025
    99-02 LS HARNESS
    99-02 LS HARNESS
    Easy to install and fast

    Easy to install and fast shipping

    Brandon
    08/04/2025
    00+ 3100/3400 Simplified Harness
    00+ 3100/3400 Simplified Harness
    Easy to install and fast shipping and

    Easy to install and fast shipping and delivery

    Brandon
    08/04/2025
    LMMF SIMPLIFIED WIRING
    very easy to install and would highly recommend

    very easy to install and would highly recommend lmmf fast shipping and arrival as well

    Brandon
    08/04/2025
    98+ 3100/3400 Tuned ECM
    98+ 3100/3400 Tuned ECM
    Sorry took me so long to get back with you I

    Sorry took me so long to get back with you I just put a new motor in the car and everything else finally got it all in there the wiring harness computer everything worked out great thanks a lot

    Gary
    08/01/2025
    Standard Switch box
    Standard Switch box
    Plugged right up to harness I already had purchased and worked great

    Plugged right up to harness I already had purchased and worked great.

    Dale
    07/29/2025
    96-99 to 00+ Injector adpater pigtail
    96-99 to 00+ Injector adpater pigtail
    NICE

    NICE

    MIKE
    07/14/2025
    LMMF Shirt series - Bubble lumina
    LMMF Shirt series - Bubble lumina
    Highly Recommend!

    I would highly recommend this business to anyone needed a wiring harness. The business is so great to work with and takes care of their customers. I accidentally ordered the wrong one at first, but I contacted the owner and he was able to switch the product before shipping. The product came very well packaged and was very fast. I think it even arrived a day earlier than expected. The product is great quality. Again highly recommend this company.

    Kaitlin Tucker
    07/04/2025
    98-05 3800 Series II simplified harness bundle
    98-05 3800 Series II simplified harness bundle

    NICELY PUT TOGETHER

    MIKE
    07/03/2025
    98-05 3800 Series II simplified harness bundle
    98-05 3800 Series II simplified harness bundle

    Couldn't be happier. Great customer service fast processing and shipment

    Michael Livingston
    07/01/2025
    98+ 3100/3400 Tuned ECM
    98+ 3100/3400 Tuned ECM

    Worked perfect and showed up fast

    Tyler Snapp
    06/30/2025
    00+ - 96-99 3100/3400 Injector Harness Adapter
    00+ - 96-99 3100/3400 Injector Harness Adapter

    Return buyer. More than pleased every time.

    Michael Livingston
    06/21/2025
    00+ 3100/3400 Simplified Harness
    00+ 3100/3400 Simplified Harness

    Works great

    Evan Potter
    06/21/2025
    Standard Switch box
    Standard Switch box

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