My 2005 Alpine has a heavy gauge blue wire, maybe 10 gauge, and a smaller gauge white wire labeled brake that were installed in the harness but are not hooked up. These were for use with trailer brakes. I traced the blue one from under the center of the dash back to the rear of the coach in the trailer lighting loom. I have been cautioned not to use the white wire, because it can cause the Vansco 2820 to fail. A 2003 should not have that issue.
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2005 Alpine 36 MDDS #75303
Tustin, Calif.
Lynn and Gail
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