I had the switch rotated 180*. So all the selections were blank, pos 7-12. I started at pos 7, not pos 1 and turned all the way to 12, not pos 6, with no change in engine sound. Once I turned the truck off and rotated the switch, it worked. Pos 1 is stock, 2 is whisper, so when I started the truck and turned it to pos 2 it got quieter so I knew it was the switch positioning. But still it shouldn't have started?
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