Our converter went out and we found it has a 2 year warranty. Also your converter charges your 12 volt battery. If your converter is out your 12 volt battery will not charge. To find out if your converter is working, first check the 120 volt outlet it is plugged into to see if it is working. If not, then check your circuit breaker. If you have 120 volt at the outlet check the fuses in the converter. If they are blown replace them. If the fuses are good check the output voltage of the converter. The output voltage should be between 12-14 volts. If not then your converter is defective. If your converter is working then suspect the battery. You can take your battery out and take it to be checked or you can buy aa hydrometer to check to see if you have a dead cell. Disconnect the battery and check the voltage. It should be at least 12 volts. If your battery is defective then replace it. If you are camping and you find that your battery is good and your converter is out you can get a inexpensive battery charger, connect it to your battery and get by until you can get your converter replaced. Remember, your lights, thermostat, heater fan, frig controls and several other systems run on 12 volts. If your 12 volts system is defective you can ruin electronic controls with under voltage, so it is important to use the proper voltages. Hope this helps.