I also have a 2020 jd e140 which has a yellow button that you depress to bypass safety, and you can mow in reverse. i fully understand how to make a jumper.
My problem is 0n the 2013 x-310 there is no obvious switch to by pass. As soon as you backup, deck stops. you have to shut off deck switch and then restart. Intolerable. I need schematic or wire color, or location of switch. i am electrically competent, and can use multi meter, to verify continuity on switches, but i do not want to reinvent the wheel. I searched internet, but found no free scematics, or diagrams of switch locations. If I bypass back up switch my problems should go away. I want to say thank you to you all. shane (vermont shane)