We have and Excella too - the same year, same length, same bed configuration. So when I saw your question... I thought to myself... hey why do they have an AC indicator on the range hood? We don't have that!
Well, we do have a red LED that is supposed to indicate AC power is connected. Our LED doesn't work. I guess it's been so long ago that it stopped working that I completely forgot it was there.
As mentioned above, reset all your breakers and see if the AC outlets work again. If not, you may have a bigger issue to tackle.
As far as the red LED indicator. Yes, it's convenient but you would benefit from knowing the AC voltage in addition to just knowing if AC is present. So, buy one of the relatively inexpensive voltage indicators and insert that into a convenient AC outlet. In addition to telling you the voltage you will also see an indication of the polarity and if the ground is properly connected. It's good to check the polarity and ground every time you connect at a new campsite.
Back to the LED. Remove the panel under the range hood to see if the LED can be replaced. I don't know if it's a single LED simply connected to a pair of wires (easy to replace) or if it's an LED on a circuit board (more difficult to replace). Either way, you can probably purchase an LED at Radio Shack.
Lucius and Danielle
1992 29' Excella Classic
1996 GMC Suburban C2500 7.4L
2005 Chevrolet Suburban K2500 8.1L
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...