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7 Here, the Bosch relay has been laid across the alternator, where we pulled the power to operate the lights. The small red wire, which makes a U-turn, is coming from the switch in the passenger compartment; the small black one grounds the relay. The thick, 12-gauge red wire is the power out to the lights, while the orange wire is the power in from the alternator. The latter holds a 15-amp fuse to protect the system.