https://www.hdforums.com/forum/softail-models/928315-what-did-you-do-to-your-softail-today-1114.html Step by step and having the proper manual you can do anything

Try checking the buttons on the handle bars, make sure you are not vapor locking (fuel lines)if it’s hot outside. Hitting the power button has been a sneaky little glitch. Inadvertently use your fingers on the control and click the wrong button accidentally or a over sized glove.