I have a 2009 Bighorn 3670RL. I noticed that my slides were struggling to come in and out as if it were trying but didn't have enough power. After talking to a mechanic over the phone, he said it was my batteries. It had been a few years, so I replaced them. Didn't improve the situation. Calling a mechanic out to the area where I am will cost hundreds of dollars, so I figured I could find a mechanic closer to the city. Anyhow, the power went went out the other night, and all my lights were really dim, and a loud buzzing sound started from somewhere and didn't quit until the power came back on. I couldn't figure out where the noise was coming from but guessing it had something to do with the inverter/convertor? I'm not real familiar with this or where they would be located, but hope I can get it figured out with a little help? I'm pretty handy.