Home > LS-24x Harnesses

LS-24x covers all of the Gen-3 engines including the LS1, the 4.8, 5.3, 6.0 Vortec truck engines, as well as the early Gen-4 24x engines, including the 05-06 LS2 GTO, 05 LS2 Corvette, and the 05-06 Trail Blazer engines (5.3, LS2 2006 TBSS). These Gen-3 engines were available in several configurations with both automatic and manual transmissions, as well as cable throttle and electronic throttle control, commonly referred to as drive by wire (DBW). We offer control systems to support ALL combinations. All harnesses include a fuse block to protect the engine/transmission circuits, a PCM controlled fuel pump relay, control wires for the cooling fan relay, and an OBD-2 diagnostic port/check engine light combo for future diagnostic troubleshooting should there ever be a problem. If we are handling the programming of your PCM/ECM and you have a moderately/heavily modified engine, local dyno tuning is a must to get your setup dialed in. We are very well versed in the programming of the computer modules specifically relating to swap use, but we advise local tuning on a dyno for moderately/heavily modified and boosted applications. Our Gen 3 24x Signature Series standalone harnesses start at $795. Please call us at (765) 378-4908 to discuss options, get a quote, or to place an order. Sort By: Price: Low to High Price: High to Low Most Popular Title Manufacturer Newest Oldest Availability 10 per page 20 per page 40 per page 60 per page 100 per page Page of 1 LS2 Gen 4 24x Harness Our Price: $995.00 24x Gen 4 engines are found in the 05-06 GTO and TrailBlazer SS, as well as the 05 Corvette. PCM shown for reference only. Not included with harness. LS1 / Vortec Harness - DBW Throttle Our Price: $895.00 Includes Vortec 4.8, 5.3, 6.0 Includes Pedal to TAC Module harness. If you're sending in your PCM for reprogramming, use the "Special Notes" field above to let us know any engine modifications (headers, cam, etc.) and gear ratio and tire size. PCM shown for reference only. Not included with harness. LS1 / Vortec Harness - Cable Throttle Our Price: $795.00 Includes Vortec 4.8, 5.3, 6.0 If you're sending in your PCM for reprogramming, use the "Special Notes" field above to let us know any engine modifications (headers, cam, etc.) and gear ratio and tire size. PCM shown for reference only. Not included with harness. Vortec/4L60E (Drive By Wire) Standard Series Harness List Price: $599.99 Our Price: $495.00 Sale Price: $495.00 Savings: $104.99 We have a few harnesses available from a supplier that are ready to go off the shelf. These are not made in-house but we have fully labeled and test ran each one. Each harness has a diagnostic port (OBD2 port) with integrated check engine light (some may just have the wire for the check engine light). These harnesses are not customizable like our Signature Series harnesses, which are built to order. Pics are for reference of the harness itself and may not be specific to your application. We will ship the correct harness you order. Vortec/4L60E (Cable Throttle) Standard Series Harness List Price: $599.99 Our Price: $495.00 Sale Price: $495.00 Savings: $104.99 We have a few harnesses available from a supplier that are ready to go off the shelf. These are not made in-house but we have fully labeled and test ran each one. Each harness has a diagnostic port (OBD2 port) with integrated check engine light (some may just have the wire for the check engine light). These harnesses are not customizable like our Signature Series harnesses, which are built to order. Pics are for reference of the harness itself and may not be specific to your application. We will ship the correct harness you order. LS1/T56 (Cable Throttle) Standard Series Harness List Price: $599.99 Our Price: $495.00 Sale Price: $495.00 Savings: $104.99 We have a few harnesses available from a supplier that are ready to go off the shelf. These are not made in-house but we have fully labeled and test ran each one. Each harness has a diagnostic port (OBD2 port) with integrated check engine light (some may just have the wire for the check engine light). These harnesses are not customizable like our Signature Series harnesses, which are built to order. Pics are for reference of the harness itself and may not be specific to your application. We will ship the correct harness you order. LS1/4L60E (Cable Throttle) Standard Series Harness List Price: $599.99 Our Price: $495.00 Sale Price: $495.00 Savings: $104.99 We have a few harnesses available from a supplier that are ready to go off the shelf. These are not made in-house but we have fully labeled and test ran each one. Each harness has a diagnostic port (OBD2 port) with integrated check engine light (some may just have the wire for the check engine light). These harnesses are not customizable like our Signature Series harnesses, which are built to order. Pics are for reference of the harness itself and may not be specific to your application. We will ship the correct harness you order. Cable-X Speedometer Adapter Our Price: $340.00 We carry the Cable-X Speedometer Adapter that allows you to retain your classic cable driven speedometer when using modern day electric VSS signal. This takes the VSS signal and converts it to a cable driven output to your gauge cluster/speedo, allowing your old cable driven speedo to work with an electronic VSS signal that modern transmissions use. GM LS-Series Engines: The Complete Swap Manual By Joseph Potak List Price: $27.99 Our Price: $24.99 Sale Price: $24.99 Savings: $3.00 Here's the most helpful LSX swap book we've ever seen, and now available here on our site! Stuffed full of info on identifying the different LS engines, helpful swap tips, PCM info, manifolds, oil pans, block differences, fuel systems, front accessory variations, transmissions, sensors, harnesses, cooling system plumbing tips, motor mounts, etc. It's all here! Written by Joseph Potak, this book will guide you through every phase of your swap project using the number one most desired swap engine in the world! Firewall Harness Grommet Our Price: $10.00 We get a lot of requests of customers wanting to buy the grommet we include with every new harness order, so we decided to make them available for purchase separately. Ideal for routing your harness through the firewall, etc. Sold individually. Free USPS shipping within the USA. Drill a 2 1/8 inch hole for the grommet. Inside diameter where you pass wiring through is .6 inch and flexible (stretchy). For free shipping at check out, select - More Carriers > Free USPS Shipping. Grommets ship via USPS First Class only. We will adjust & refund accordingly if you're unable to select the free shipping option.