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How did you check the continuity of the switch? And are you sure that when the switch is wired in your brake lights aren't in fact staying on and simply not turning off? Cause if your lights work when you jump the wires and you have air pressure at the air pak then it must be the switch...

The switch should be tee'd into the airline that goes to the service glad hand. Pull the switch then crank the truck and let it air up. Kill the truck and set the parking brake and chock the wheels. Climb under truck and have someone else step on the brake pedal. Air should start venting from...