Your converter should have 13.5V with no load and in boost mode 14.3V up to 14.7V max is the specification on the Progressive Dynamics converters. Measure your 12V at the battery. If you have over 14.7V, then you have a bad converter. It will burnout some LED lights as it did mine. Not the built in LED lights from Heartland, but the ones I installed replacing the incandescent light bulbs. My refrigerator had good freezer temps, but the refrigerator was at 50F. It took two days to figure out what was going on. That is when the LED lights started to go out and I measured the DC voltage, called Progressive Dynamics to verify the maximum voltage at boost. One call and trip to Camping World on the road and I had the new converter. It took me six minuets to install. I am going to have Progressive Dynamics repair the old one to have as a spare. Also, if the voltage is high, check the level of the battery electrolyte in each cell. If needed, add distilled water.