Mine would occasionally keep running when I turned the truck off
Then one bright sunny day when the birds were singing and the breeze was gently blowing, I started the truck and the starter kept going after the engine started then smoke started coming out from under the dash.
I flew out of the door and opened the hood ... luckily one of the battery terminals was loose enough to pull off with my teeth!
It only melted the main ignition wire slightly but the switch was pretty much toast .... even if it wasn't toast, it was going to be replaced. Summit Racing had some perfect plug and play switches, so I bought that one and then installed a fuseable link for the next time it decides to tries to self destruct!