On the drivers side the connector coming from the vehicle side wiring harness is the distribution point for the rear of the coach. You will notice that the connector has a blue wire on one side and the other side of thc connector has no mating wire. This is an extra wire in the harness that comes from the front connector in the side panel about at the knee. This is actually designed for an electric trailer brake circuit. However it could be used for any purpose needed.
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