i just went on a ride with a fully charged, new battery on a 99 polaris 500 magnum and the battery went fully dead before i got back,does anyone know the cause? please advise ty slick672

 

Welcome to the forum! First off charge the battery(make sure battery connections are tight!) and crank machine,check charging at the battery while running,should be 14-14.5 volts. If showing only battery voltage or lower check at the front of the atv by the radiator for the regulator/rectifier. Check that all wires are plugged in. The red wire was a problem on this model for coming unplugged! If all connections are good, then 9 out of 10 times the reg/rectifier is bad.If charging is good,then you could have a "bad" new battery(can and does happen) OPT

 

welcome to the forum. most likely the recifir or bad connection on the recifier. most likely it's located up under near the radaitor.