Don, you are correct the 3rd switch controlls the three hydraulic slides. The three dials outside are used to shut off each of the three hydraulic slides. I can not tell you which is which, but just turn one off and see which slide does not move, then lable it. continue isolating the other two untill you have them all labled.
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Jason & Wendy
2014 Ford F-350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
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