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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
It has been stated that 85 per cent of 12-volt batteries fail before they should. When hooking up deep cycle RV batteries there are two different wiring types. A parallel hook-up is used when there is more than one 12-volt battery. The positive posts are connected together, as are the negative posts.