If we are talking about a factory radio this may help. Turn the key on but do not start the truck. Leave the radio off, push the button that says "set" then push the button that says "scan" this will change either the hours or the minutes. Then push the button that says "seek" this will change the other. That should do it for you. If you have further questions, just drop a note. I hope this information was useful, if so, please click the accept button.