I recently purchased a 1981 model Pearson 424 which has a Crown Marine Converter mod 3012-3. The unit had been left charging unattended for about 6 months during which time the batteries ran completely dry. When I put water in the batteries (they were all bad and had to be replaced), the converter quit working. I presumed a fuse was blown. The unit is receiving 110 V (a small red light mounted on the front panel is lit), I replaced two fuses in the internal wiring (they were okay). Is there a reset button or some other circuit breaker that I have not discovered?