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Thats why I said what I said. Who knows what pvt numbnuts did to that trailer when it was in the shop. Whether he painted the right color on the glad hand (or simply installed the right color) or put a new valve under the trailer and paid no attention to which way it was supposed to be hooked...

Climb under your trailer and trace the hoses back to the valve. It should be labeled service on one port and emergency on the other. Hook them to your truck accordingly.