Above all, buy the best battery you can afford. You can't have too much battery! A standard sealed lead-acid battery is okay for the engine, but I would suggest an AGM battery for the coach. AGMs are longer lasting, charge quicker and can stand abuse. Make sure it is a deep cycle battery for a RV, NOT A MARINE TYPE DEEP CYCLE. Marine type deep-cycle batteries are designed to start engines along with their deep-cycle capabilities. They WILL NOT last in an RV.
Make sure the replacement is the same design i.e. + post on left (or whichever). Compare to original battery. Switch breaker off for coach. Replace battery. Hook up the RED cable to + FIRST, then black cable to ground. Switch power back on. You can charge it if you want to, but I never noticed any need.
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