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Honda Rancher Discuss all models of the Honda Rancher 350/400/420

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Old 07-26-2011, 07:55 AM   #1 (permalink)
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Battery problem

I have a 2002 Rancher 350 that eats batteries. I have replaced the battery 3 times because it would drain down so low it could not be recharged. I had a mechanic look at it and he found a blown fuse and I then replaced the battery again and also installed a battery tender. It started up great for a period of 3 months and one of my roommates unplugged the battery tender and several weeks later the battery had 1.7 volts and was shot. I noticed that my headlights did not work before the battery went dead. Could it be that the switch for the headlights is shorted? Any suggestions would be appreciated.
I bought another battery but have not installed it yet.
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Old 07-26-2011, 01:10 PM   #2 (permalink)
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Install the new battery ,leave the key out,put a meter on each wire leading away from the fusebox,see where you have voltage at..If it has voltage,and is a key on power only wire,then that's where you have a short,or a fault...Chase the wire to the accessory it powers...Or,you can install a battery disconnect that basically unhooks either the ground,or the positive stopping the battery from being drained by vampire accessories like radididido memories,clocks,whathaveyas power loss...
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Old 07-28-2011, 05:33 AM   #3 (permalink)
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Thanks for the reply.
I will certainally try that but how do I know if it is a key on cuircuit?
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Old 07-28-2011, 03:11 PM   #4 (permalink)
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Hook a test light,or a meter up to that circuit,and if it gets voltage when you turn the key on then it's a key on circuit(headlights,dash lights,gauges,taillights,etc. are key on circuits)...
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Old 08-07-2011, 10:23 PM   #5 (permalink)
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I am having the same issue with my 2004 Rancher 400. I have replaced the battery and bought a small battery tender. Even the battery tender can't keep up with whatever is draining it. I am starting to think that it has something to do with the way my winch is wired in but not sure. If you figure out what is draining your battery, please let me know.

Thanks.
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Old 08-08-2011, 06:55 AM   #6 (permalink)
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If you have your winch directly to your battery it will slowly drain it, just by being on standby. Or mine does anyways... I cut the wire and installed a toggle switch so I could turn off the current.
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Old 08-08-2011, 07:29 AM   #7 (permalink)
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The battery tender that you use for charging your battery has to have a auto cut out when the battery is fully charged. The battery tenders without auto cut out will cook your battery.
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Old 08-17-2011, 09:10 PM   #8 (permalink)
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Thanks for all of the advice. I ended up having to get a new battery and a Battery Tender Jr. I have to leave it plugged in when not in use, but it fires up every time. No more dead battery.
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Old 08-17-2011, 11:04 PM   #9 (permalink)
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If it is still draining the battery often from sitting a few days without the tender hooked up,or when riding,then you need to check your grounds really well because if they're loose,or not making a good ground,then it will not charge the battery when running,and the atv will be mostly running off of the battery,and the stator will possibly soon fry from trying to charge the battery full time,plus it is something that needs to be addressed so you won't get stranded 10 miles west of bum f Egypt...Eventually(prolly a lot sooner) the new battery will be fried from repetitive severe discharging...
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Old 09-03-2011, 09:27 AM   #10 (permalink)
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Thanks for all the replies and problem is solved. Battery tender light will stay on all the time and if the tender is not pluged in to 110v the battery drains and I must have fried it when I tried to charge it when it was down to 1.6 volts. I now leave the tender on 24/7.
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