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Might get better responses in the hisun forum. Presumably this is an EFI model. If so they need all the wiring. Replacement harnesses are available for a responsible cost ($150ish) for most hisun models. If it's EFI it needs all that stuff to function without throwing codes and going into limp mode. There's a good description on the various hisun repair manuals (download section) towards the back explaining how the Delphi EFI system ties all the inputs and outputs together and what each piece does.