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16. Since the convertible had a modern wiring harness conversion, the brake light switch above the pedal used simple female spade terminals. The cruise module has two wires that connect to the brake light switch—one to the hot side and one to the cold side of the switch. Due to the fact the Mustang had LED brake lights, the cold side connection required a five-terminal relay, which you can source from any auto parts store (the wiring information is in the installation manual).