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There are 4 possible answers but one only applies to one outlet
GFCI: This protects outlets near water, this includes sink, bathroom, and patio, may include others (Dineing area in my coach)
Inverter: This too powers the same outlets in my coach, it also powers Television and radio nd microwave area outlets.. Many inverters have built in breakers
The special one is for a front mounted tv, ignition interlock but you said "3" so that's not it. (Outlet off when motor r unning)
Finally we have the rest, Sometimes there is a 2nd GFCI, some people tihnk all outlets should be GFCI protected so an RV may have two or three and sometimes they are not all that easy to findn. Generally they show a small red light when tripped (I know of at least one that works the other way around red light when NOT tripped)
You may also have two breaker boxes (one for inverter powered loads) IF, that is, you have an inverter.
As to where they hide the main breaker box.... Happy hunting.
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Home is where I park it!
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