I have one of those in my 47 panel. The switch has 4 positions. I would assume off, low, med and high. I say I assume because we're not to the point of installing that item yet. Rich

Last edited by Twin Jimmys; 10/09/2022 8:22 AM.
1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed