LynnandCarol wrote:
OP... The Problem is when I disconnect shore power, we have no 12V power. The battery voltage was tested on the battery terminals with nothing connected. The trailer wires were tested disconnected. This a TT and we are parked for the winter, so this will only be a problem for us in the short term if we loose park power which has happened in the past. We will get the batteries tested (they are over 2 years old) and pull and check the plastic auto type fuses above the circuit breakers. Thanks for the assistance and sorry if OP wasn't clearer!
You have an open circuit between the battery and the 12v panel.
If you want to dig into this.... all you do is check voltage along that positive wire from battery to the 12v panel. Most likely a fuse, switch or other connection. At some point you will find 12.6 volts on one side of something and zero volts on the other side. Clean, repair, replace, tighten, or adjust that item.
