The stock Sportsman voltage regulators are terrible. They are a known problem and can easily burn out from excess heat, especially when using high amperage accessories. Do not replace it with another OEM unit! This new improved regulator uses Mosfet technology. What does that mean? It is different circuitry that allows it to run much cooler, has a cleaner regulated energy, extends battery life, and removes the stator load resulting in more power. Best of all it will last MUCH longer then OEM. Simply plug in and go, no modifications required. Replaces Polaris part numbers: 4014029, 4015229, 4014543, 4014405, 4015231, 4015230, and 4015214. FITS THE FOLLOWING MODELS: 2015-2016 ACE 325 2015-2016 ACE 570 2015 HAWKEYE 325 2013-'16 SCRAMBLER 850 2014-'16 SCRAMBLER XP 1000 2016-'19 SPORTSMAN 450 HO 2010-'14 SPORTSMAN 550 2014-'19 SPORTSMAN 570 2015 SPORTSMAN ETX 2011-'14 SPORTSMAN X2 550 2015-'19 SPORTSMAN X2 570 2011 SPORTSMAN X2 850 2015-'16 SPORTSMAN XP 1000 2010-'16 SPORTSMAN XP 850