Carefully mark all lines before taking any off--suggest a picture with smartphone first. Cover all cable endings to keep from inadvertent touching to metal parts. Use this time to clean and repaint the battery tray.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired