| Mistake | Consequence | |---------|-------------| | Assuming wire colors are unique | Two unrelated circuits might both use “Brn/Wht” (brown/white). | | Ignoring connector orientation | Pins reversed if you view connector from back vs. front. | | Overlooking diode or resistor | AWD or fan circuits fail if you bypass without it. | | Using wrong year diagram | Mid-year harness changes (e.g., 2018–2019) are common. |