Re: Battery DIsconnect ??

Help! I have a 97 fleetwood bounder just installed 2 new batteries which are now indicating low on dash (after 1 day) 

Ive noticed unusual sound coming from converter (someone mentioned it might be fan going bad) and my ECC box has been making a sort of “crackling” sound. I live in my RV and always leave Battery Disconnect in the off position. 
ive unplugged the converter to see if battery continues to drain but im at a loss! Any ideas, would certainly appreciate!🤷‍♀️