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11. Once you’ve routed the harness to the driver’s side of the engine compartment, all you’ll have left is the small harness with the red and blue wires in it. This is the section of harness that needs to go into the passenger compartment and the headlight switch. Remove the body plug found next to the brake booster and cut a 3/8-inch hole in the plug for the wiring to pass through and then feed the wiring into the car, securing the plug back in place.