Originally Posted by firerzr

Does anybody out there have any ideas on adding a second battery or just replacing the battery with an optima or something? I have added a stereo and some lights to my RZR and my low battery warning light keeps flashing.

Originally Posted by W_A_Watson_II

Mine flashes with out any add on's and running the head lights. wondering if it's the battery, or not enough charging in the alternator.

Originally Posted by martymoe

as you may know, i've recently figured out what the rzr charging system problem is.. it is not the stator, it makes plenty of power, the voltage regulator is ok too, but gets hot and shuts down..
i've found the wiring between the voltage regulator to be too small and the wire gets hot and drops 2 or more volts before it gets into the system..
the location of the voltage regulator under the drivers seat is also a problem because at trail riding speeds there isnt enough air flow to keep it cool and it shuts on and off to keep cool (there is your charging problem or a whole lot of it)
on this 09, i was looking for a good place to put the power commander and something struck me weird (like there was something missing) but it didnt occur to me what was missing.. a little later on we took off the hood to fill it with anti freeze and i noticed something out of place in front of the radiator at the top.. guess what.. it was a voltage regulator.. i'll bet it works much better up there where it can get air.. one of the problems is when the fan is running it takes a lot of power and the voltage regulator gets hot trying to keep up.. now, with it in front of the radiator the fan will draw air across it and help keep it cool.. it should work great.. i know by simply making a heat sync out of aluminum and bolting my voltage regulator to it made a drastic improvement so this should work very well..