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  1. B

    What is this?

    The switch I was talking about was the yellow knob. The flat one with the picture on it is probably an electric switch for the PTO or transfer case. If it's a flat bed, it might hydraulically tilt. Sent from my SM-G930VL using Tapatalk
  2. B

    What is this?

    It's a air operated PTO switch. Used on fire trucks to switch the transfer case from road to pump. If it's on a Duramax, it probably just activates a PTO by air pressure. Sent from my SM-G930VL using Tapatalk