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Hmmm, you are plugged in to A/C power--I'll take this to mean plugged in to 110-120 vAC shore power. no lights: lights are probably 12vDC. Receptacles have 120vAC, microwave has power: Indicating that you do indeed have 110-120vAC power. No lights, no radio, no bump out (?) power, no awning power: Indicates that you do not have 12vDC power. No refer: I'm thinking that the refer/fridge has to have 12vDC power for the control panel. No air conditioner: That one confuses me. My RV knowledge is that the A/C units work totally off of 110-120vAC power only, I believe the t'stat gets it's power from the A/C unit, not the RV 12vDC system. IF the A/C is on a circuit breaker turn the breaker to the "OFF" position wait about 30 seconds and turn the breaker back on. IF the A/C still does not work you will have to access the terminals on the breaker to check for incoming and outgoing 110-120vAC. Is it possible that your inverter has died? I do not think so. It sounds as if problems is that you do not have 12vDC in your unit. Some units get their 12vDC supply straight from the battery with the inverter charging the battery as needed. Some units use the inverter to supply 12vDC to 12vDC powered appliances, such as lights, fridge control panels, the radio, etc. Some units have a fuse directly wired into the positive battery cable and not at the inverter. These fuses are usually found somewhere near the battery and in a lot of cases within an electrical box located underneath the RV. Why the heck they put them in places hard to access I will never understand. It is possible that the fuse, usually 30 amp, is blown. IF it is then you will not have 12vDC in your unit IF yours is the type that all 12vDC appliances run off of the battery and not the inverter.
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