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I've got a 2000 F250SD, full 4 door, and today the door locks started acting up. One will lock the other will half way and one won't do anything. This changes sometimes and sometimes all work. Seems like all of this just started today. Do I need to do the penny or tinfoil mod or is this a relay switch problem? Someone told me to replace the panel on the door that has all of the controls.
While you're in there, be sure to hit anything that rubs or twists on anything with the appropriate lubricant. Oil or grease, depending on the parts.
I did all my lock servos a couple of years ago, but recently one was acting up again. When I got it out of the latch mechanism I discovered it still had lots of torque, but it just wouldn't move a mechanism with a lot of friction.
I did not open up the servo again at all, and after proper re-lubrication of the latch mechanism, everything works "as advertised" and snappy again.