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Thank you! Good guess without the knowledge and history of this rig. I will look at that - the amperage and whether the breaker is bad. There is nothing in place of the rooftop A/C unit and I have made repairs to the ceiling in that area without any sign of old wiring. So, who knows what he did? Thanks again!

I have this '85 New Horizons which has a circuit panel containing 3 circuit breakers. One of which trips when I plug into shore power. I do not know what ANY of the breakers do, except that one of the two remaining breakers that stay on control electric outlets and all 12 volt systems (lights, water pump, heater fan) kick over to the inverter (you can hear it switch when we plug in). We no longer have an Air Conditioner (removed by previous owner), so I can assume one breaker may have been for that. But the other breaker is unaccounted for. Any ideas? Is a schematic available? Also, we changed all 12 volt bulbs to LED. Since then, they only flicker when turn on while on shore power. They work fine off the battery. I'm thinking the problem is with the LED bulbs - not the system. Voltage at socket when on shore power measures 13.6 volts.