Re: Wiring Schematic for 1988 Xplorer 228
I really don't know anything about what you have but If I were to toubleshoot mine my first step would be to see if it has it's own circuit breaker. Then, see if wires are broken going into the outlet and if they are live Also see where they go to and continue to trace them and check to see if it is live incase the wire broke inside. Eventually they will lead to the power source or to something live.
Did they work before or did you just get it? Is it the 110v or 12v outlet? I have had a bad 12v outlet burn out on my car many years ago.