Originally Posted by dpinvidic
This is a good start.
Outlets are normally wired in series (chained in a string). If there is a lose connection at the first outlet of the string, the rest of them will not work.
Same with a GFI plug. It will provide GFI protection to all of the down stream plugs. They add stickers to the plugs that are protected by a GFI.
Start your debugging at the GFI PLUG because it is the first one of the string.
Using a meter, check for proper voltage on the input terminals of the plug after removing the cover plate. If the voltage is bad here, go Check the inverter.
Hi Ho: Dan has the right answer. Why guess what (or where) the problem lies. Just get a simple, inexpensive VOM and measure where the voltage is (and where it isn't). Or course wiring diagrams help to determine what the measurements mean. I have actually had outlets fail so that they had power coming in but the output terminals were not making contact. Anyway, this approach is the one that knowledgeable service people use. A measurement is worth a thousand guesses.