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Old 02-09-2006, 06:30 PM
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Battery Charger is messed up?

Alright, this is rather odd.

I was at my grandmas the other day and was top-off charging the batteries in her lawn tractor (23hp kohler powered simp, 1 summer old) and her brushhog tractor (52 Ford 8n). I do this about once a month, about 10-30 minutes each, sometimes longer when I use the 2amp charge rate.

First, I go to the simp and the charger clicks and clicks, the little ammeter going from 0amp charge rate to 10amp charge rate (thats the highest it reads) and back click click click. I check the switch, and its at 12v, 10amp.

Next, I go over to the old mower tractor (71? wheel horse, 14hp kohler) and the same thing happens at the same 12v setting. Onto the generator, same click click click, same setting.

So onto the 6volt 8n. This time when I turn it on (turn charger off before disconnecting) I put the switch over into the 6v postition. It charges like a normal, sane battery charger.

In conclusion, the charger works fine @6volt, but at 12volt the stupid thing acts like a cat in cold water. I did try 12v 2amp and didn't hear any hmmmmmmmmmmmmmm noise, and it registered 2amp and went down to basically 0 after about 5 seconds.

thanks guys,

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Old 02-09-2006, 10:15 PM
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Usually when they max out hold for a sec & drop dead there is something wrong with the battery.

Put a AM meter on it to see it its putting out.

as It cold out at the time?

How old are the bats?

You should get battery maintainers they have some solar powered from harbor fright cheap!!


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Old 02-09-2006, 11:17 PM
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Doc here,

Sounds like to me, you have a short on the 12 volt side of the charger..

The transformer is primary side 120 volts, and the Secondary side of the transformer on the two outer wires is 12 volts AC, and Any outside wire to the center tap wire off the transformer will give you 6 volts AC.

The 12 volt side of the transformer will go to the 12 volt side of the switch, The center tap of the transformer 6 volt ac, will go to the 6 volt side of the switch, The center of the switch will go to the rectifier + side, and the transformer (other wire will go to the ground side.)

Your meter will hook between the + cable and the + side of the rectifier. If you have a thermal reset, It should be here also..

So look on everything in line when the switch is selected to 12 volts for a dead short.

The rectifier may have a couple of electrolytic caps in circuit also some do some don't, and the rectifier may be two in series, (1/2 wave) or 4 in series(full wave) IT all depends on the quality of the charger..

At $ might be cheaper to just get a new one though..

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