Short in the ACC pole

I am telling you to go at the problem from the Newmar COACH side of the electrical. Have you pulled the Batteries to verify you did not miss a wire or disconnect the smaller gauge wires from both the chassis batteries and the coach batteries. DON'T TELL ME YOU HAVE DONE THAT WHEN YOU HAVE NOT. I have had over 42 years customers swear they have doublechecked after they replaced batteries and they have either a short or a system does not work. They come in and in less than 10 minutes I find the loose wire or POS small gauge wire connected to the negative or a loose wire the batteries were installed on and after awhile, the weight has cause a short. Then they pay me about $100 because they were positive they had done it correctly. On your year, do you have some of the interior ceiling lights that has a 3 position wall switch? When engaged one way the lights are normal brightness and when switched the other way they have 50% dimmer brightness? Did your original Coach batteries, were they 6 volt(making 12 volt) or 12 volt and which do you have now, 6 volt(making 12 volt) or 12 volt. Last, did you do as I suggested and disconnect the small gauge wires both Neg and Pos from the Battery banks and leave just the Heavy duty large Cables connected? Then see if you have the short? Doug