Every time I select the Aux option my Ford F-150's stereo, it always changes back automatically to AM/FM radio or off. Nothing I do works

Every time I select the Aux option my Ford F-150's stereo, it always changes back automatically to AM/FM radio or off. Nothing I do works

First, read the owner's manual for correct operation. You'd be surprised at the numbers of people who think they've been doing something correctly and haven't. If you have followed the instructions and it's still not working, contact the dealer.

Have you tried plugging something into the auxiliary input