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First I gotta get a new starter(even though i think it's still good)...
Quick check would be to give the starter a "bump" in all gears. Safely of course. Will the starter catch in R? How about D? Try wiggling the shifter, will it work now? (out of adjustment) Put the key in "run" position, set E-brake, put the truck in R (not running) Are the back-up lights on? If the BU lights are on in all gears, the switch is bad. (Or the switch is not in position. There is a small tab that goes into a recess on the column.)Mine left me stranded the first time. There are 2 pr. of wires, one for the BU lights, and the other for the neutral start. Just to get me home I used a jumper on the neutral safety. CAUTION, the starter will crank in all gears by doing this.I attributed mine going to the constant forward/reverse pushing snow.
Go to the S terminal with a test light to ground. Have an assistant crank it and see if it lights up.