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I have a 2010 Mack CXU 613. I would like to hook my dump trailer lift axle up to the trlr aux switch on my dash. Does anyone know where I can pick this up? Hopefully somewhere outside the cab.

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The TRLR AUX switch operates the center pin hot system. It is used to supply 12V to the trailer center pin only when the key is off. It is used by gasoline tanker trucks to operate the over fill protection devices on the trailer when loading. The switch will not power the center pin with the key on or parking brake released. When the key is on the center pin is powered all the time to operate trailer ABS systems.

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