We ship Mon - Fri. 12PM EST cutoff time for all orders. Returns not accepted for: build-to-length pigtails, harnesses, or extensions.

  • GENUINE ORIGINAL EQUIPMENT HARNESS CONNECTORS FOR LS-SERIES ENGINES & TRANSMISSIONS
GENUINE ORIGINAL EQUIPMENT HARNESS CONNECTORS FOR LS-SERIES ENGINES & TRANSMISSIONS

LS-Series Connector Kits & Pigtails

LSwiring.com specializes in Original Equipment (OE) replacement engine and transmission harness connector kits and build-to-order pigtail assemblies for GM LS-Series engine harnesses. Represented by meticulously drawn 3D models, our products are exceptionally identifiable so that you can eliminate any doubt while browsing the replacement connectors within this store.

Our LS connector selection is unmatched. We are confident you will not find another store offering a selection as complete as ours. If you feel we are missing a connector found on an original GM LS engine and transmission harness, let us know! We'll do our best to source it .

Automotive TXL Wire

Being an LS engine harness manufacturer, we stock every wire size and color combination found within the GM LS-Series engine and transmission harnesses. While our replacement pigtail assemblies are built with 18 AWG and larger wire, you can shop our store for 22 AWG through 8 AWG automotive TXL wire.

In addition to TXL wire, we also offer hard to find fusible link wire from sizes 20 AWG to 12 AWG. Be sure to protect your engine harness by using appropriately sized fusible link wire when connecting to the battery positive terminal or any battery positive post or stud.

Featured product - Automotive TXL Wire

  • 10 Gauge Black Automotive TXL Wire Per Ft
    SKU: 101-00174-QTY10
    from $30.00
    $39.00
    from $30.00
    Sold out
  • 10 Gauge Black w/ Pink Stripe Automotive TXL Wire Per Ft
    SKU: 101-00632-QTY10
    from $30.00
    $39.00
    from $30.00
    Sold out
  • 10 Gauge Dark Green w/ Light Green Stripe Automotive TXL Wire Per Ft
    SKU: 101-00633-QTY10
    from $30.00
    $39.00
    from $30.00
    Sold out
  • 10 Gauge Purple Automotive TXL Wire Per Ft
    SKU: 101-00136-QTY10
    from $30.00
    $39.00
    from $30.00
    Sold out
  • 10 Gauge Red Automotive TXL Wire Per Ft
    SKU: 101-00138-QTY10
    from $30.00
    $39.00
    from $30.00
    Sold out
  • 12-AWG-(3.0-mm²)-Automotive-Fusible-Link-Wire-by-the-Foot
    SKU: 101-00649-QTY1
    from $6.75
    $9.00
    from $6.75
    Sold out
  • 12 Gauge Black Automotive TXL Wire Per Ft
    SKU: 101-00132-QTY10
    from $17.00
    $22.25
    from $17.00
    Sold out
  • 12 Gauge Black w/ Pink Stripe Automotive TXL Wire Per Ft
    SKU: 101-00144-QTY10
    from $17.00
    $22.25
    from $17.00
    Sold out
  • 12 Gauge Black w/ Red Stripe Automotive TXL Wire Per Ft
    SKU: 101-00145-QTY10
    from $17.00
    $22.25
    from $17.00
    Sold out
  • 12 Gauge Black w/ White Stripe Automotive TXL Wire Per Ft
    SKU: 101-00630-QTY10
    from $17.00
    $22.25
    from $17.00
    Sold out
View all

Production Crimping Tools

We are serious about quality. Our pigtail and harness assemblies are assembled using precision machined crimping dies that ensure proper terminal crimp heights and widths.

Our production facility is equipped with crimping presses and applicators for high volume work to support Aptiv (formerly Delphi), Molex, and Kostal terminals.

Rennsteig's PEW 12 crimping tool system is our go-to for low volume, high precision, production work. This modular tooling system supports offers crimping die sets for nearly all of the terminals found within GM's LS-Series harnesses.

Custom Requests & Assemblies

While LSwiring.com offers no customization beyond selectable pigtail wire lengths, our partner, EFI Connection LLC, has been offering custom LS harness solutions for more than 15 years.

Send your custom inquiries to help@eficonnection.com.

Excellent experience! You guys had just what I needed. Thank you for excellent service and fast order processing.

Chris H.

I was able to find just what I was looking for. My order was received the day after I ordered. PS - Your website rocks!

Martin M.

You guys offer hard to find connectors that even my local GM parts department was not able to source. Many thanks!

Seth T.