For my Craftsman YS4500 riding mower I was able to bypass all the safety kill switches by bypass two of the three. This model mower has three (that I can find). 1 under the seat. 1 goes to the brake linkage. And 1 for the blade engagement. The one under the seat is easy to see by lifting the seat. I left that one alone. My mower kept shutting off when the brake was released and nothing engaged. Basically, you jumper the whites (white wires) after unplugging the switches with small male spades. The brake kill switch is located above the blade deck, and is accessible under the hood. Follow the brake linkage rod to where it goes thru the frame.Carefully move the brake and follow it down.The switch button pushes up from the bottom to kill the engine (or actually keep it running when in park). Pull this switch plug apart leaving the switch assembly in the frame.The engaged blade kill switch it up under the top of the dash board and also is accessed with the hood open. Again, if you carefully rock the blade engagement lever and follow it, you will find the switch. It's mounted under the top.Pull this whole switch and plug out together by pinching and wiggling out. Pull the switch away from the plug and throw it in your tool box. I made jumper wires with in-line 2 amp fuses with male spades that fit into the female plugs. Jumped whites on both plugs and taped them in place and secured them so they wont fall into something. Now all the safety switches were bypassed (including the seat, neutral start, reverse gear blade engagement and park brake switch. Be careful, the mower will now start in gear and or with the blades on and no-one sitting in the seat.Watch your feet are not near the blade deck at any time.
Depending on the model- some of them you can runa paperclip thru and basically make a hot permant contact. If its not working at all you can press the swith down with a piece of metal( to ground it) WHILE IN OFF POSISTION and duck tape it down with metal too.