:DI have a John Deere 318 been working on for a couple years finally got it going but will not engage the mower blades It used to run good and then it would just shut the blades off. I would let it cool off and start again and it would run the blades for awhile then quit. Now it won't kick in at all I put a new switch and voltage regulator on but it still won't kick in . Please help!!