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Another battery question

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Author  [Modern View]

10-23-2009 18:58:31

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The battery on the WD was fully charged a few days ago but when I went into the tractor shed today it was almost dead. it had rained in and the battery was wet all across the top. Would this cause it to discharge, or do I likely have a short?

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10-24-2009 17:30:13

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 Re: Another battery question in reply to JimDRIL, 10-23-2009 18:58:31  
Might be the VR sticking, if your system has one, if you have an alternator, don't try that trick of removing the ground or hot wire from the battery, while its running, that little spark you would see is the diodes in your alternator leaving this earth, and going to diode heaven!

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10-24-2009 17:50:26

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 Re: Another battery question in reply to DiyDave, 10-24-2009 17:30:13  
I may have missed something but I don't think any one said any thing about unhooking the battery with it running. Plus that would not find a battery drain when it is shut off. Oh by the way on an alternator if you unhook the battery cable with it running it can in fact kill a person because yep the diodes go bye bye and the VR kicks in and can put out over 90 volts at max amp which can = DEAD person

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10-24-2009 18:52:31

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 Re: Another battery question in reply to old, 10-24-2009 17:50:26  
Old- I wasn't saying that anybody mentioned the old is the generator charging, lets pull a wire off the battery trick, but was trying to beat them to the punch, LOL. Normally in this type of thread it gets mentioned sooner or later!

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10-24-2009 20:55:52

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 Re: Another battery question in reply to DiyDave, 10-24-2009 18:52:31  
Yes if it is a charging problem but this is a battery drain problem so most of the time in this type of problem no one say it

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John T

10-24-2009 06:17:46

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 Re: Another battery question in reply to JimDRIL, 10-23-2009 18:58:31  
Rain water isnt very conductive and it would take a longgggggggggggg time for it to drain a battery, Rain water mixed with some rust particles is a bit more conductive but still it would take a long time for it to drain one so Id say a short is more likely the cause. If when you remove a battery cable and scratch touch it you see lil sparkies that indicates a current draw but its much safer to remove say the ground cable and scratch touch it to frame (away from near top of battery) to look for sparkies.

If you unhook the ungrounded battery cable and clamp one end of a test lamp lead on the bare battery post then you can use the tip probe end of the test lamp to look for a short as it will lite up if it gets a ground.

If when you shut the tractor off the ammeetr swings to a heavy - discharge the Cutout relay may be stuck closed which will drain a battery veryyyyyyyyy fast plus the genny gets hot. If the belt were removed the genny would actually spin in such a case. However a stuck relay is a very fast battrery drainer as opposed to a minor high resistance short which takes much longer to drain a battery.

The battery itself may be at fault, have a shop load test it maybe. If it still runs down even if you remove a battery cable or ground when shes setting its a battery problem

Give the batery a good cleaning on top and re charge and insure the cutout relay isnt sticking closed and if she still runs down teh test lamp can help find a short

John T

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10-23-2009 20:33:02

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 Re: Another battery question in reply to JimDRIL, 10-23-2009 18:58:31  
Possible but not very likely that the wet top of the battery is your problem unless it is very dirty and has lots of boiled over battery acid on it. I would charge the battery off the tractor then with a meter or test light hook up the - cable and hook a test light or meter between the + cable and see if you get a voltage reading or your light lights. If you get something then you have a short in the system if nothing then could be the wet battery top but like I said not likely

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10-23-2009 20:15:48

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 Re: Another battery question in reply to JimDRIL, 10-23-2009 18:58:31  
When cars had generators, sometimes the voltage regulator (which was just a relay with several contacts) would stick in the closed position. As a result, the generator would act as a motor and run, subsequently causing the battery to completely discharge. If you have generator and cutout relay on your WD, that may be the cause of the problem.

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Clay in MI

10-23-2009 19:34:19

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 Re: Another battery question in reply to JimDRIL, 10-23-2009 18:58:31  
Others with more knowledge may disagree but I have 12 volt batteries running fence chargers that sit out all summer in all weather. They last for at least a month before recharging. I think you must have a short.

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Jeff B.

10-23-2009 21:25:44

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 Re: Another battery question in reply to Clay in MI, 10-23-2009 19:34:19  
Clean your battery from any dirt...oil, or whatever. Sometimes dirt, grime and water combined can make a track between the posts of your battery and short it out on itself...making an electrical track from positive to netative. That's all it takes to discharge it.

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