The engine can work normally with the wiring harness. The engine needs to start, which requires a starting line for the starter to work. The battery on the car needs to be charged. Gasoline cars also have ignition system lines,
air conditioning compressor control lines, the working state of the engine sensor circuits and so on. So the engine wiring harness is a necessary part of the normal operation of the engine
Xi 'an Cummins
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