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Tractor Talk Discussion Forum

battery charger

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PhilcaseinWPa

10-16-2006 07:07:18




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I went out to start my diesel and some dummy left the key on after pulling the fuel shutoff. Someday I will learn. Well no big problem I'll just get the charger. My charger is a Schumaker 40/ 200 amp boost unit both 6 and 12 volts. It has a dial timer with an off position and a dial voltage amp selector with an off position an an amp meter. I always set the selector switch and then turn on the timer. I had last used the charger on my 6v case 200. So I hook it all up set it to 12 v/10amp charge and the meter is showing 20 amps. I shut it off check all my connections set it to 12v/ 40 amps and the meter shows 80 amps. hmmm? So I shut it down and rotate the selector dial through all the positions (off, 6v/10amp, 6v/40amp 100amp boost, 12v/10 amp, 12v/40amp 200amp boost). Set it back to 12/10 and same thing happens, so afraid something might get burned up I turned it off. Then just out of curiosity iI set the selector to off and turned on the timer and it runs and shows 20 amps. What the ???
So I think that something is stuck on the 6 volt setting. One final thing I did was take it to the 200 and hook it up at 6/10 and again at 6/40 and the amperage read correctly. Does anyone have any suggestions other than get a new charger? I've had this one since the early 80s and it has saved me many a time.

Phil

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PhilcaseinWPa

10-17-2006 05:36:33




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 Re: battery charger in reply to PhilcaseinWPa, 10-16-2006 07:07:18  
Thanks to all who replied.
I hooked it up last night at 12v/40amps and set it for about 30 minutes. I stayed in the garage and kept an eye on it. After 15 minutes it had enough charge for the 200 amp boost to start it. Then I disconnected the charger and drove the tractor around awhile hoping the alternator would charge the battery up. We'll see when I try to start it next time. Seems the charger still works. Thanks all.
Phil

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Jon Hagen

10-16-2006 17:06:57




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 Re: battery charger in reply to PhilcaseinWPa, 10-16-2006 07:07:18  
If the battery is stone cold dead,it will take a lot of amps untill it recovers a bit of charge. Check to make sure the charger connections are correct then start it on the 6V setting. when the amps go to 0 on the 6 V setting,then go to the low 12V setting.



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Sam#3

10-16-2006 11:01:00




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 Re: battery charger in reply to PhilcaseinWPa, 10-16-2006 07:07:18  
You might take a quick check of the output voltage when set to 12v. A good charger will limit the output to about 14.5v. A cheap one may let it run to maybe 18v. The charger is supposed to regulate the current to the setting BUT cheap ones may not. The low or dicharged battery will draw all the charger will allow because the internal resistance is almost zero. Overvoltage will ruin a battery quickly, too many volts = overcurrent = heat = warped plates = internal short = more current, Etc. Etc. (Maybe a big bang)
I suppose I should have said cheap OR defective.

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Dan-IA

10-16-2006 10:23:04




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 Re: battery charger in reply to PhilcaseinWPa, 10-16-2006 07:07:18  
I got at least two just like what you said, found 'em at wallyworld. Anyhow, I've worn out the timer. Burned out an ammeter. Had one struck by lightning. And they've always read more than the selected amp draw when I first start a charge on something. You can try using a single-blade ammeter to check the built-in meter, but I'm thinking that what you describe is normal behavior. At first. It usually settles down in a couple minutes. Well, that or my batteries are in bad shape and I don't really notice.

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Janicholson

10-16-2006 07:41:56




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 Re: battery charger in reply to PhilcaseinWPa, 10-16-2006 07:07:18  
Chargers do go bad, I had a charger start on fire two months ago while connected to a lawn tractor battery. (the windings shorted in the transformer on the primary side and it became toast.
Howevewr I think your charger is just looking at a very dead battery. As such it might put a considerable current in the leads beyond the rated setting. If you watch it, and tha fan in the charger is operating, I would let it go. You might try hooking it up to your car/truck battery to see if it mellows out on a charged battery. If so I would use it. Hooking to a 12v bat with a 6volt setting should do nothing at all, the voltage will be less than the battery. Good luck, JimN

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PhilcaseinWPa

10-16-2006 07:59:27




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 Re: battery charger in reply to Janicholson, 10-16-2006 07:41:56  
I'll try it the fan was working and the battery was pretty low since I parked it on thurs pm and left the key on since then. Thanks
phil



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