Another worthwhile purchase is a laser thermometer. You can point it around the converter area and find hot wires so easily with one of these. Once again, from the beginning, my converter was pumping out all it could do but all of that power was being wasted heating wires that were not tight instead of putting electrical energy into the battery.
As others have said, you need to see exactly what is on the converter output connections and not on the wires themselves. My laser thermometer would have shot up to almost 175 degrees compared to the solid connections at room temperature.