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Whether you’re doing an LS engine swap or working on the LS motor already in your ride, you won’t get far without a good...
Whether you’re doing an LS engine swap or working on the LS motor already in your ride, you won’t get far without a good electrical system. That’s why many gearheads opt for a new stand-alone wiring harness.
A stand-alone LS wiring harness kit is a complete replacement for that original engine electrical harness, using all-new components that’ll eliminate the complications and frustrations that often come from using the old, original engine wiring.
Stand-alone LS engine wiring harness kits are available for the 4.8, 5.3, 5.7, 6.0, and 6.2...
Whether you’re doing an LS engine swap or working on the LS motor already in your ride, you won’t get far without a good electrical system. That’s why many gearheads opt for a new stand-alone wiring harness.
A stand-alone LS wiring harness kit is a complete replacement for that original engine electrical harness, using all-new components that’ll eliminate the complications and frustrations that often come from using the old, original engine wiring.
Stand-alone LS engine wiring harness kits are available for the 4.8, 5.3, 5.7, 6.0, and 6.2 liter versions of the LS engine.
If you’re pulling your LS swap engine from a junkyard, it’s going to be several years old already, which means the factory wiring harness will probably be pretty worn out—if it’s not missing or hacked up by the previous owner to begin with. And if you have any problems removing the LS from the vehicle, there’s a good chance you’ll snap a few connectors and break some wires in the process.
An all-new stand-alone wiring harness means you don’t have to worry about creating any electrical gremlins by re-using the worn-out original LS wiring. Instead of fiddling with brittle connectors and wires, by using a fresh stand-alone wiring harness for your LS engine swap, you get all new, reliable components.
Better still, many of the LS stand alone wiring harnesses you’ll find at Summit Racing have improved labeling, easy-to-follow instructions, and color-coded wires to really help simplify your LS swap or LS electrical repair.
And stand-alone LS wiring harnesses are often cross-compatible with several engines in the LS family as well, which takes a lot of the guesswork out of picking the best wiring harness for your particular LS engine.
Depending on the exact one you choose, a stand-alone LS wiring harness will typically include all the essential wiring and connectors you need to hook up the individual engine components (like the vehicle ECU, injectors, crank/cam sensors, etc.) and get your LS motor running. Many of these LS stand-alone harnesses come with OE-style connectors so you can retain the original factory LS electrical components too.
While all harnesses here are different, it’s likely that you’ll probably need to provide things like your own ECU, sensors, coil packs, and other necessary electrical system components—but to be sure, please check each specific harness’ product overview page for exact details on what’s included.
For starters, you should determine the exact LS motor you have—because there are dozens of different variations of the Gen. 3 and Gen. 4 LS engines in 4.8, 5.3, 5.7, 6.0, and 6.2 liter displacements. We have a handy LS Engine Identification Guide to help you out.
A big distinction you’ll also have to recognize is whether you’ve got a drive-by-wire throttle body or a drive-by-cable mechanical throttle body, and since they may use different connectors, knowing the type of fuel injector you have in your LS is vital as well.
Next, you should also consider what transmission you’re using with your LS engine. An electronically controlled automatic transmission will have different wiring demands than a manual transmission.
Again, the good news with using many stand-alone wiring harnesses is that there may be some cross-compatibility between different variations within the LS engine family. But always check to confirm that the wiring harness you’re looking at is the best one for your needs. The Summit Racing tech department will gladly help answer that question.
If you’re just repairing your LS engine’s wiring, the good news is that you may not need to replace your complete stock engine harness. The better news is that Summit Racing offers several sub-harnesses for connecting things like your ignition coil packs, brake ABS sensors, and more.
In many cases, you simply remove the OE sub-harness from the rest of the main harness and replace it with the new one. These new sub-harnesses for the LS typically use factory-style connectors for an easy, plug-and-play install—one that will save you the hassle and expense of replacing the entire engine writing harness too.
Wiring Harnesses, Holley EFI, LS1/6, 24X/1X, Main Harness, Plug-and-Play, Extended Length, for Dominator/HP EFI Systems, Chevy, 4.8-6.0L, Each
Part Number: HLY-558-133
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
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Wiring Harness, Engine Harness, 1968-69 Cutlass, v8, With Carb Idle Stop Solenoid, 4 Barrel, With Gauges, Each
Part Number: SUM-RP22313
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harness, Plug-N-Play Pass-Through, Each
Part Number: MPA-76404-01A
Estimated Ship Date: Jun 16, 2025 if ordered today
Estimated Ship Date: Jun 16, 2025 if ordered today
Wiring Harness, Elite 2000/2500 GM Gen IV LS/LSX, DBW Ready Terminated Harness, Bosch EV6, Each
Part Number: HTH-HT-141367
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wire Extension, 48" Gen 4 Flex Fuel Sensor
Part Number: ICB-WEFLX40-48
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Wire Extension 72" LS Gen 4 Accelerator Pedal Position Sensor LS3 LS2 LC9
Part Number: ICB-WEAPP40-72
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Intake Air Temperature Sensor Wire Harness Extension 24" LS Relocation
Part Number: ICB-WEIAT30-24
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wire Extension 24" LS Gen 3 IAC Idle Air Control DBC LS1 LM7 LQ4 5.3 4.8 6.0
Part Number: ICB-WEIAC30-24
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wire Extension, 48" LS Gen 4 Fuel Pressure Sensor Connector LS3
Part Number: ICB-WEFPR40-48
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harness, Vapor Canister Vent Solenoid Harness, Use with 20907779 in place of 20948082, Cadillac, Chevy, GMC, Hummer, Isuzu, Suzuki, Each
Part Number: ADO-19257603
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wire Extension, 48" LS 2 Wire Coolant Temperature Sensor Connector LT LS3 LS2 LS6
Part Number: ICB-WECTS30-48
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harness, Fog Lamp, Chevrolet, Each
Part Number: RNB-645-536
Not Yet Reviewed
Estimated Ship Date: Jun 13, 2025 if ordered today
Estimated Ship Date: Jun 13, 2025 if ordered today
Wiring Harness, Elite 2000/2500 GM Gen III LS1/LS6, Non-DBW Terminated Harness, Each
Part Number: HTH-HT-141360
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harness, Elite 2000/2500 GM Gen IV LS/LSX, Non-DBW Terminated Harness, Bosch EV6, Each
Part Number: HTH-HT-141365
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harness, Elite 2000/2500 GM Gen IV LS/LSX, DBW Ready Terminated Harness, Bosch EV1, Each
Part Number: HTH-HT-141366
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
ECU, Fast XFI, Main Harness, Chevy 1997-2004, 5.7L, Kit
Part Number: FST-301101
Not Yet Reviewed
Estimated Ship Date: Aug 4, 2025 if ordered today
Estimated Ship Date: Aug 4, 2025 if ordered today
Fuel Pump Repair Part
Part Number: CRT-888601
Not Yet Reviewed
Estimated Ship Date: Jun 12, 2025 if ordered today
Estimated Ship Date: Jun 12, 2025 if ordered today
Wiring Pigtails, Female, for Infiniti, for Nissan, BMW, Buick, Chevy, Chrysler, Fiat, GMC, Oldsmobile, Porsche, Smart, Subaru, Toyota, Volvo, Each
Part Number: SMP-S-1686
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harnesses, Replacement, Standard Length, Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Saab, Saturn, Kit
Part Number: ADO-13581173
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2025 if ordered today
Estimated Ship Date: Jun 25, 2025 if ordered today
Wiring Harnesses, ABS Wheel Speed Sensor Wiring Harness, Standard Length, Chevrolet, Each
Part Number: ADO-15248662
Not Yet Reviewed
Estimated Ship Date: Jun 24, 2025 if ordered today
Estimated Ship Date: Jun 24, 2025 if ordered today
Wiring Pigtail, Vehicle Speed Sensor, 2-pin, 700R4, 4L60E, 4L80E, Each
Part Number: ATP-JE15
Not Yet Reviewed
Pigtail, Blower Motor Wiring, Stock Replacement, Cadillac, Chevrolet, GMC, Each
Part Number: ADO-15-75221
Not Yet Reviewed
Estimated Ship Date: Jun 25, 2025 if ordered today
Estimated Ship Date: Jun 25, 2025 if ordered today
Wiring Pigtails, 4-pin, Female, Gray, Buick, Cadillac, Chevy, GMC, Isuzu, Oldsmobile, Pontiac, Saturn, Each
Part Number: SMP-S1352
Not Yet Reviewed
Estimated Ship Date: Jun 12, 2025 if ordered today
Estimated Ship Date: Jun 12, 2025 if ordered today
Headlamp Wiring Harness
Part Number: SMP-LWH104
Not Yet Reviewed
Estimated Ship Date: Jun 11, 2025 if ordered today
Estimated Ship Date: Jun 11, 2025 if ordered today
Headlamp Wiring Harness
Part Number: SMP-LWH110
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
Wiring Harnesses, Holley EFI, LS2/3/7, 58X/4X, Main Harness, Plug-and-Play, Extended Length, for Dominator/HP EFI Systems, Chevy, 6.0-7.0L, Each
Part Number: HLY-558-134
Not Yet Reviewed
Estimated Ship Date: Tuesday 5/27/2025
Estimated Ship Date: Tuesday 5/27/2025
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Summit Racing™ Reproduction Wiring Harnesses SUM-RP22313
