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Discussion Starter #1
I bought a Exide AGM battery for my 2005 Polaris 500 H.O. about 6 months ago.
The other day I went to start it and the battery was almost dead, I thought I might
have left the switch on so I charged the battery up and after a few hours I started
reading the battery. Day 1 12.39v, Day 2 12.25v, Day 3 12.19v, Day 4 12.14v.
That's where I'm at now, I also took a reading and it stayed above 10v when starting.
So is this voltage drop normal? I could see if I didn't ride for awhile the battery would be
dead. I have never had this starting problem before with my old battery. Its under
warranty.
 

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Discussion Starter #3
Is the machine charging while running? Should have around 14.5 volts at 3000 rpm. If not, you need a voltage regulator.
The ATV reads 14.3v at 3000 RPM, I went to start it and battery is to low to even start it so I had to recharge
it to get it running.
 

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Put a full slow charge on the battery and then load test it. You likely have a bad battery from the sounds of it. You may want to check for parasitic draw if it appears the charging system is good and the battery is in spec.
 

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Check the stator for a short to ground - if the stator is shorted it may read a charging voltage, but AC may be present riding on the DC ans AC will discharge a battery and kill it while riding and showing a good charging voltage.
 

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Check the stator for a short to ground - if the stator is shorted it may read a charging voltage, but AC may be present riding on the DC ans AC will discharge a battery and kill it while riding and showing a good charging voltage.
Yep. That's a possibility too. Need to check/test the entire charging system to determine where the problem is.
 

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Un hook the battery and charge it. Then keep track of voltage while it is unhooked. If it draining while sitting there......... then you know if its the battery or not.
 

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Discussion Starter #8
Thanks for the replies, I'm going to unhook the battery and read it over a few days to see what happens.
 
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