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2015 Polaris ranger 570 XP
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The first thing I would check is the battery, with a load test. A bad battery will not only produce the symptoms you mentioned but if a bad battery is run for a long time it can damage the charging system. Charging systems on Rangers are more "delicate" than those in automotive applications. They don't produce as much current and can be overloaded more easily. An internally shorted battery can cause that kind of overload.
Battery connections are also suspect. A bad ground at the chassis or bad connections at the battery terminals will cause similar problems. You can't just "look" at the terminals or chassis grounds and be certain there isn't a problem. They must be disassembled, cleaned and inspected. Bad connections at any one of those points will not only prevent starting by limiting current they will prevent charging.
Once you've eliminated the above sources it's time to look elsewhere.
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