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If you decide to use your factory switches and perform the necessary rewiring (all detailed in the instructions), you'll have to provide separate ground wiring for all interior lights (Ford lights are case grounded). The owner opted to skip the upgraded dome light modification and the required rewiring, but the radio delay and headlight warning still requires a signal that the door has been opened. We opted to simply add one of the included GM door switches. A pilot hole was drilled just below the factory door switch.