What type of gauges are you talking about to test the IPR and what exactly am I testing? How about the 12 volt issue, what posts should I be checking (or not touching) for voltage?

Is the "scanner" different from the gauges you mention or same thing and what am I looking for in the ICP? I did unplug it and turned over the engine but nothing changed.

Where does the scanner plug in on these things? I have a 97 expedition with the plug under the dash on it but there is nothing similar in the same location on the truck.

Thanks to those who are working with me on this. I only get to mess with it in bits and pieces so it's taking a while.