Battery condition is extremely important. No voltage regulator can work correctly with a bad or weak battery. Always fully charge your battery before performing any charging system tests or replacing parts. If there is any doubt, have the battery load tested or replaced. Please Note: There were 2 different regulators used on 2017-2018 Polaris Sportsman 570 models. Please compare your original to our pictures. Our RMS020-100174 regulator will ONLY replace an original that looks EXACTLY the same. The other possible regulator is RM30421. Aftermarket replacement part for: Polaris Farmhand 450 -- 2017 Polaris Hawkeye 325 -- 2015 Polaris Scrambler 1000 XP -- 2014-2017 Polaris Scrambler 1000 XP Euro -- 2015 Polaris Scrambler 850 -- 2014-2016 Polaris Scrambler 850 Euro -- 2014-2015 Polaris Sportsman 1000 Touring -- 2016 Polaris Sportsman 1000 Touring Tractor -- 2017 Polaris Sportsman 1000 XP -- 2015-2016 Polaris Sportsman 1000 XP Tractor -- 2016 Polaris Sportsman 325 ETX -- 2015 Polaris Sportsman 450 HO -- 2016-2019 Polaris Sportsman 550 -- 2010-2014 Polaris Sportsman 550 Forest -- 2011-2014 Polaris Sportsman 550 Touring -- 2011-2014 Polaris Sportsman 550 XP -- 2014 Polaris Sportsman 550 XP Touring -- 2012 Polaris Sportsman 570 -- 2014-2018 Polaris Sportsman 570 6x6 -- 2018 Polaris Sportsman 570 6X6 -- 2017, 2019-2020 Polaris Sportsman 570 EFI -- 2019 Polaris Sportsman 570 EFI UTE F/C -- 2015 Polaris Sportsman 570 EPS -- 2019-2020 Polaris Sportsman 570 SP EFI F/C -- 2019 Polaris Sportsman 570 Touring -- 2014-2018 Polaris Sportsman 570 Touring EPS -- 2015 Polaris Sportsman 570 Touring EPS EFI F/C -- 2019 Polaris Sportsman 570 X2 EPS -- 2015 Polaris Sportsman 570 X2 EPS Tractor EFI F/C -- 2019-2020 Polaris Sportsman 850 -- 2015-2016 Polaris Sportsman 850 Forest -- 2012-2014