Electrical questions March 25, 2016, 02:52:34 pm Yahoo Message Number: 159576My dad and I are replacing the converter in 01 MB. After we first disconnected the negative terminals and then outgoing positive ones, we still had 12v power. The coach battery was also disconnected. The lights and fan still worked. Where was the power coming from? Is the solar system powering them somehow? Also, how do I shut the solar system down with the old heliotrope solar controller? Confused, Tanya