Converter Issue

There is a high probability that it is a unitized design like the one pictured above. The converter itself is the electronics in the bottom, back. It is most likely powered by a connection to a 120 volt circuit breaker. Some will share it with another circuit--in my last trailer, it used a dedicated breaker. There are two 30 or 40 amp fuses in the battery line between the converter and the batteries--they should protect against reverse polarity situations. The biggest issue is the WFCO converters are junk and almost universally used. DO NOT REPLACE WFCO with WFCO. Even when the work, they ruin batteries. My sons and I have had WFCO converters fail in 4 out of 5 trailers--I'm sure the 5th is on the way. They should be replaced b other, better, brands such as Progressive Dynamics or BoonDocker. Check out BestConverter.com--they are good with advice. The unitized design like shown above has 12 volts and 120 volts inside, so only mess with it if you are comfortable with electricity.