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To emphasize "replacing the terminals" at the engine starter battery.  Right after getting our coach I had several "no starter engagement" during engine start.  The positive wire coming off the battery (wet cell with caps) had severe corrosion going up into the wire about an 1 1/2" hidden by the heat shrink.  I cut the wire back to clean copper and replaced the terminal.  Also, at that time I replaced the wet cell batteries (source of the corrosion) with AGMs no issues since!

Yes, the green death gets inside them even with the heat shrink. I use heat shrink that has is adhesive lined, it truly seals the lug connection to help keep this from happening. Luckily we had this in the warehouse at work and we just so happened to have 4/0 locomotive cable so I made all new cables for the Wanderlodge. 

Some photos of my old Wanderlodge cables and the new one getting heat shrink.