Just in case anyone gives a damn:
I found out what was the problem with my truck--no thanks to this site and it's visitors.
It was a stinkin' rear wheel sensor. What the HECK? Dodge puts these danged things in your autos, just so they can go bad and cost you a fortune to fix them.
(If you think I'm a _itch in print, you should meet me face-to-face!)
My post was: I have Idiot Lights (air bag, engine, brakes) on, but everything checks out O.K. The child protection door locks are supposed to lock up at 15 mph, but now they don't. When the locks quit working, the speedometer and milage meter quit, too. Battery tests okay. No blown fuses. HELP
(I hope Dodge goes BUST)