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firerzr · #1 (**permalink**) August 17th, 2008, 08:33 PM

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.

W_A_Watson_II · #2 (**permalink**) August 17th, 2008, 08:51 PM

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.

fanjules · #3 (**permalink**) August 18th, 2008, 02:04 AM

I left my RZR for a fortnight and the charge dropped from 12.8v to 12.3v. They self discharge really quickly. 13.0v is "full". You need to keep them charged up inbetween rides. I've not had any issues with my low power light coming on.

That said, the stock battery is a bit shit and others have replaced it with something better. A 2nd battery is a good alternative as this gives you the option of really big amp hours but with the added advantage of being able to quickly remove it and save yourself 20lbs or so when not needed.

But if you're having issues with hardly any lights on then you need to check the charge. Don't forget the RZR has a built in voltmeter. I run 5 PIAA lights on top of all the other lights and the fan working overtime... and not had any trouble at all. Keep it topped up!

Red Dirt RZR · #4 (**permalink**) August 18th, 2008, 03:28 PM

Quote:

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.

To install an Optima, all you need is a battery box.

RPMFAB.com battery box

Quote:

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.

Here is a good post by martymoe, this may or may not be your problem.

Quote:

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..

That was taken from this thread.

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