Originally Posted by FFX160_CT
Yes, it's a bummer. In my FF, the previous owner (?) tried to write down which breaker switches were for which electrical item, but for the life of me, I can't read any of the labels! Sadly, I think you have to test them all yourself and label accordingly.
Sadly, your best bet is to turn one off and see what doesn't work. The "circuit breakers" are going to be, for the most part, for just your 120v devices, the 12v lights, charging circuit, pump, etc. are going to be fused through a separate output and protected by automotive style fuses. You should have one that is only for the A/C, another for the microwave, and then another few (1,2,3 or 4 depending on your rig's size) for the wall plugs, both inside and outside and the electric element in the water heater. The "upside" is, by figuring them out and marking them yourself, they won't be wrong (as is the case with my "pre labeled" circuit breakers in my 5er
), but, as in FFX160_T's case, please print legibly!
Yes, to answer your original post, there are devices available for tracing electrical circuits back to the breaker box (I've got one - I wire houses for a hobby), but, IMHO, not worth buying one for a "one off" use. It plugs into an outlet or, with adapter, screws into a light socket and emits an emf signal over the line. Comes with a receiver that you hold up next to "unknown" circuit breakers until you hear the tone; that's the breaker controling the circuit the emitter is plugged into. In your case, it would be easier (cheaper) to just take a table light and turn off a circuit breaker, then go around plugging it in until it doesn't light, make note of the plug and continue around until you've covered them all. The A/C will be easy, just turn on the unit and flip breakers until it goes off. By and large, the only thing on the breaker will be the A/C; same holds for the microwave. Those two, and usually the water heater electric element, are on circuits by themselves.