Electrical Problems-Need your help

Ok, after further investigation as mentioned above the AC's run off of 120 volts. Furnace doesn't work and lights are going dimmer by the minute. Appears no 12 volt power to the t-stats cause the AC's or furnace not to come on.

Everything in most RVs is 110V. Unless you have a European RV, you should NOT have 220-240 volts ANYWHERE! 30 or 50 amp or not. Depending on the wiring, there could be 240 V between the two hot pins on your plug, but nowhere else. There are generally two circuits in a 50A RV. one from each side of the line. Both are 110-120V, usually with two ACs there is one AC on each circuit. You have probably popped a circuit breaker somewhere. Mine has two breakers on the generator, plus two on the breaker panel inside. At the campground pedestal, many older systems just have one big 120v line to the pedestal, and it is split to both sides of the plug.

First, the converter does not have any 30/50 amp feed. The converter converts 120 vac to dc power to keep the battery charged, and to power the 12v needs of the camper.

The loss of 240v power could be anything from a faulty power cord to ???

Since you have a voltmeter check the voltage at the circuit breakers. Be careful, 240v can kill you. If you have any reservations about troubleshooting 240vac, you should have an RV repair person fix your problem.

Hmmm, something's not making sense. A converter only outputs 12 volts from a 120-volt input, and the A/C's also run on 120 volts. Normally, there are no 240 volt appliances in most RV's. Could you mean an "inverter" instead that outputs 120 volts from a 12-volt input? Although the A/C's would not be connected to that, due to the high current draw. Do you have a single thermostat with a multi-zone temperature setup?

if you have an inverter did you check the breakers on it?

By the way, all breakers were good. I reset them all just make sure. My gut tells me the 30/50 amp feed from the converter is toast.