My ign. switch turns on & off with any key, screwdriver, or coin. I bought a new switch & tumbler from one of the major specialty parts place near me. I put them in & it was the same way. I took them back & got the curiosity going on everyone in there. They started bringing more of them out of stock & they all are the same way. It was a popular brand of reproduction parts. I don't know what came out of it but I'm not going to tell were I park my truck.
George