Hi I have a question on my tt. It's a 2001 sportsmen with two batteries and two 15lb tanks . My question is my converter is always running. I can hear it humming all the time, is that normal? It doesn't get hot, just warm. One battery is one year old the other battery is seven years old. I disconnected the seven year old battery to see if the humming went away but it didn't. Thank you. Happy mother's day!!!!!!!