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Carefully route the other two cables to the control head under the dash. With a small angle bracket, secure them to the original cable mounts and their wires to the levers. Next, connect the plug from the wiring harness to the blower switch. The truck's original brown power wire will need to be cut and have a male spade crimped on the end that will attach to the red-and white-striped wire from the A/C harness.