Swapping Ford Modular Engines: Wiring Guide - DIY Ford Ford Wiring and Connectors. Using Ford factory wiring harnesses is an option for most engines and projects. However, the newer the engine and vehicle, the more difficult it is to use the factory components. When using factory computers and wiring, pay close attention to the connectors. Ford frequently changed them, even within model years. FORD Wiring Harnesses - Engine Swap - Free Shipping on Find FORD Wiring Harnesses with Engine Swap and get Free Shipping on Orders Over $99 at Summit Racing!