Hey had same problem for couple of years, guys on here got me fixed up. Mine was low voltage from battery. Turned out to be a charging problem, after a lot of small changes that didn't work. Mine old thread is on here for different checks you can try. Some thing that is real easy if you have a battery jump box, when mine would not engage I hooked jump box to it and it worked just like it is suppose to.
Which told me battery voltage was to low to engage blades. Good luck this site has so many sharp guys if its not this they will get it done. Jon:smile: