I am having trouble with my fema trailer electrical system. I am by far not an electrician. I am having trouble with the 12volt system. I have been told that you do need a battery even though the 110volt plug is being used for the main power. I have also found out that the 12volt battery runs the igniter for the water htr and the heating system, I have hooked up a battery but i am not receiving 12 volts to the breaker. PLEASE HELP!!!!!!!! If anyone has had similar problems or may be able to give me any advice it will be greatly appreciated. I am willing to have an electrician come and look at it so please call me at 504-905-4606 I am located in luling and more than willing to bring it to you.