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Old 03-18-2012, 09:21 PM   #1 (permalink)
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Honda Trx420 Charging problem.

Hello I own a Honda Trx420 FourTrax Rancher and have been haveing issues were if i dont start it for a few months the battery went dead,well the last time this happened I jump started the ATV but as soon as i took the cables off the battery to let it run it would quit completly. Two weeks ago i bought a new battery for it and it started and runs fine so today i get the voltmeter and test the battery an it says 12.25 while off then runing on idle it says 13.80 and runing with lights is 13.49 but leaveing the voltmeter o nthe battery i pushed the throttle to rev the enging and it droped down to 11.00 10.00 9.00 8.00 then stoped droping at around 7.00 but it would bounce around from 7.00 to 10.00 while giving it steady throttle but as soon as you let the throttle go and it returned to normal idle it climed back up to 13.80. I have read elsewhere that when giving it throttle it should stay at nearly 14.00 is this true and if so what coould be causeing my drop like this?
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Old 03-18-2012, 09:29 PM   #2 (permalink)
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Welcome to the forums form OK. Maybe the alternator or whatever its called on these isnt working properly? Yes it should be around 13.8-14V when running and no more than 12.6V when off and no draw on battery.
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Old 03-18-2012, 09:55 PM   #3 (permalink)
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i agree with bobs330. it sounds like the charging system which is called the stator isnt producing the right current. i would test the stator/coil and regulator/rectifier. if you have the owners manual, it should tell you how to and what current rating to have or you can download one online for around 7 bucks. hope this helps!
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Old 03-18-2012, 10:48 PM   #4 (permalink)
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Welcome to the forums. X3, your charging system isn't working properly. More than likely, a bad stator or a bad regulator/rectifier. My guess would be a bad regulator/rectifier. By the way, a good battery should read at least 12.6 volts when fully charged. With the battery installed and the engine revved up, you should see somewhere around 13-15.5 volts.
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Old 03-18-2012, 11:35 PM   #5 (permalink)
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Thank you for the advice fortunately i have a service manual so ill check in that now about how to test everything and hopefully will find out the problem i nthe next couple days.
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