2012 GM 3500HD question

/ 2012 GM 3500HD question #1  

Hay Dude

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Challengers: MT655E, MT555D, MT535B, Massey 7495, Krone 4x4 XC baler, 2-Kubota ZD1211’s, ‘20 Ram 5500 Cummins 4x4, IH 7500 4x4 dump truck, Kaufman 35’ tandem 38K trailer, Deere CX-15, 2 Pottinger Hay mowers, NH wheel rake, Claas 30’ tedder
What is this knob/switch for?
Its not the 4WD Selector, the 4wd selector shifter is on the floor.
 

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/ 2012 GM 3500HD question #2  
Maybe pto switch....:2cents:
 
/ 2012 GM 3500HD question #4  
PTO rpm lock set.
 
/ 2012 GM 3500HD question
  • Thread Starter
#5  
Thanks!
 
/ 2012 GM 3500HD question
  • Thread Starter
#7  
 
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