Complete your LS swap with a wiring harness

LS swap wiring is crucial and it is recommended to ensure your LS engine swaps are wired up. Your older car is not set up to run the LS engine. This means that you should get your hands on the right wiring harness to run it.

What are your options for running LS engines?

When you want to get your LS to run, you have two main options – either to get a standalone harness or set up with a carburettor. A carburettor is a pretty cool idea, but if you are sticking to the fuel injection, in some cases, you can retrofit your stock harness. However, it is important to understand that it requires more than basic wiring knowledge. There is also the option of plug and play standalone harness.

What you need to know about a standalone harness

You may be wondering what a standalone harness means. It is used for engine control. Compared to factory wiring harnesses, standalone harnesses are a bit smaller and come with fewer connections. This is mainly because it is not meant to run a lot of additional options such as fuel management or cruise control.

With all this being said, whilst standalone features at least four connections to get the engine running, other connections should be made for sensors for data logging, to the computer and so on. An LS swap harness is generally quite simple but it can be more complex. However, you can still handle the installation with some patience and basic knowledge.

The need for additional options

If you are in a smog state that requires pollution controls, or you are swapping your LS into a vehicle that needs to function with the additional options, you can always buy a factory fit harness that is designed to run your LS. You should keep in mind that the model and make will determine the manufacturer.

Get the right stuff

Most LS swaps use standalone harnesses because they are simple and affordable. It is crucial to remember that not all LS engines are designed the same. It is, therefore, important to do your research and buy the correct wiring harness.


While installing your LS swap wiring could be simple, you need to plan for a lot of test fitting and the time you spend mocking things up to reduce mistakes. Installing a harness can be challenging, considering the wiring should pass through the firewall. You will have to find a place to mount the fuse block and PCM inside the vehicle while ensuring there is a lot of slack in the wiring to run the electronic wiring. Outside the firewall, you should ensure all the connections can run to their correct positions without limiting each other’s reach.

Written by a Guest Contributor.