Skip to content
  • Home
  • All products
  • 3100/3400 Engine
  • 3800 Engine
  • LS
  • ECOTEC Engine
  • 2.2 GM
  • TRAILBLAZER
  • Powerwheels
  • Toyota
  • Apparel
  • Contact
    • Return Policy
    • Contact Information
    • Terms of Service
    • Privacy Policy
  • FAQ
    • Troubleshooting and Helpful links
    • Install Guides
Log in

Country/region

  • Canada CAD $
  • United States USD $

    LMMF SIMPLIFIED WIRING

    • Home
    • All products
    • 3100/3400 Engine
    • 3800 Engine
    • LS
    • ECOTEC Engine
    • 2.2 GM
    • TRAILBLAZER
    • Powerwheels
    • Toyota
    • Apparel
    • Contact
      • Return Policy
      • Contact Information
      • Terms of Service
      • Privacy Policy
    • FAQ
      • Troubleshooting and Helpful links
      • Install Guides

    Country/region

    • Canada CAD $
    • United States USD $
    Log in Cart

    Item added to your cart

    View cart
    ALL PRODUCTS 3100-3400 ENGINE 3800 ENGINE ECOTEC ENGINE 2.2 (non ecotec) ENGINE TOYOTA ENGINE LS ENGINE TRAILBLAZER 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 
    • 3100/3400/3800 Extended Length Heavy duty spark plug wires

      3100/3400/3800 Extended Length Heavy duty spark plug wires

      3100/3400/3800 Extended Length 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 
    • 00+ 3100/3400 Simplified Harness

      00+ 3100/3400 Simplified Harness

      00+ 3100/3400 Simplified Harness

      Regular price $300.00 USD
      Regular price Sale price $300.00 USD
      Unit price /  per 
    • 98-05 3800 Series II simplified harness bundle

      98-05 3800 Series II simplified harness bundle

      98-05 3800 Series II simplified harness bundle

      Regular price $460.00 USD
      Regular price Sale price $460.00 USD
      Unit price /  per 
    View all

    Let customers speak for us

    from 112 reviews
    Very easy to install great product I have almost everything from you guys between party mode

    Very easy to install great product I have almost everything from you guys between party mode switch throttle bracket harness and computer. I got like two more things to get and I’ll have almost everything you got.

    Timothy Philhower
    04/15/2026
    LMMF Adjustable 3100/3400 throttle bracket
    LMMF Adjustable 3100/3400 throttle bracket
    Love this shop and the customer service is prompt and very helpful

    Love this shop and the customer service is prompt and very helpful.

    Greg Clark Clark
    04/15/2026
    LMMF SIMPLIFIED WIRING
    Switch mount

    I chose not to use it in my current build, but may need to use it in my future builds. The switch mount fits as it should. It it sleek and well made.

    Greg Clark Clark
    04/15/2026
    LMMF 45° Switch Box Mount
    LMMF 45° Switch Box Mount
    Always easy to find items

    Always easy to find items. Good quality products. And good customer service afterwards if needed

    Brian lende Lende
    04/15/2026
    LMMF SIMPLIFIED WIRING
    Got it as a spare

    Got it as a spare unit to have on hand. Looks great.

    Brian lende Lende
    04/15/2026
    89-99 3100 harness and ecm bundle
    89-99 3100 harness and ecm bundle
    Easy

    Nice web site easy to order. And great customer service.

    Brian lende Lende
    04/14/2026
    LMMF SIMPLIFIED WIRING
    Clean

    Haven't used it yet. like always looks good and Clean. Never a disappointment in quality.

    Brian lende Lende
    04/14/2026
    96-99 to 00+ Injector adpater pigtail
    96-99 to 00+ Injector adpater pigtail
    Ryan really knows his stuff

    Ryan really knows his stuff, very knowledgeable Great products, great customers,

    Greg Clark Clark
    04/14/2026
    4t65e transmission Hotwire
    4t65e transmission Hotwire
    I absolutely love the whole set up

    I absolutely love the whole set up, with the simplified harness, tuned ecm and the transmission hot wire... And the best part was the customer service, he answered all my emails and even called me direct, to help with the troubleshooting questions. The car runs like a top! Thank you for everything!

    Greg Clark Clark
    04/10/2026
    Standard Switch box
    Standard Switch box

    Great customer service, the owner actually Fields his own calls and is very helpful in trouble shooting your build. I would recommend to anyone in the demolition derby sports!

    Greg
    04/07/2026
    98-05 3800 Series II simplified harness bundle
    98-05 3800 Series II simplified harness bundle
    Love it seems to make car a lot more alive then

    Love it seems to make car a lot more alive then stock ty very much

    Robert Ward
    04/01/2026
    98-05 3800 Supercharged Tuned ECM
    98-05 3800 Supercharged Tuned ECM
    Very good products and very nice people will

    Very good products and very nice people will helpu in anyway u need i really appreciate that u guys care for ur costumers shows alot

    Robert Ward
    04/01/2026
    LMMF SIMPLIFIED WIRING
    Works great easy to hook up and seems to b

    Works great easy to hook up and seems to b working good will find oit more at the end of April

    Robert Ward
    04/01/2026
    4t65e transmission Hotwire
    4t65e transmission Hotwire
    Awesome product fast shipping and excellent

    Awesome product fast shipping and excellent customer service

    Anonymous
    04/01/2026
    99-02 LS Drive-By-Cable Standalone Harness
    99-02 LS Drive-By-Cable Standalone Harness
    Nice and long giving you options on where to

    Nice and long giving you options on where to mount coil packs and giving the wire more clearance from headers

    Shayla Garrett
    03/31/2026
    3100/3400 Extended Crank sensor harness
    3100/3400 Extended Crank sensor harness

    Subscribe to our emails

    Country/region

    • Canada CAD $
    • United States USD $
    Payment methods
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Visa
    © 2026, LMMF SIMPLIFIED WIRING Powered by Shopify
    • Choosing a selection results in a full page refresh.
    • Opens in a new window.