PTO engages and disengages fine with bush hog not attached. As soon as I attach the 7’ bush hog I can’t get the PTO to engage. Just grinds.... any help would be very appreciated. Tried putting the clutch in, no help. If I turn the tractor off and engage the PTO then start the tractor it’s fine. Just have to jump it off my truck..... may be a charging issue with the alternator.