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Allis Chalmers Discussion Forum
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wd battery over charge

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yorkie

03-22-2006 18:10:34




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i recently rebuilt my wd and it had so much compressiona 6 v would not start it so i bought an 8v the problem is the amp gauge is always pegged near 20 amps this causes the battey to really move the water to almost over full . also when i pull out the light switch the switch seems to smoke while it is out any one tell me what is wrong with this charging problem?




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Steve in N.J

03-24-2006 21:33:10




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 Re: wd battery over charge in reply to yorkie, 03-22-2006 18:10:34  
Could possibly be a few things. First, if you're using a 3 brush gennie, the third brush may need to be adjusted. Sounds like the gennie is in "full field" mode. The switch shouldn't smoke. If the switch is smokin' theres either a draw downstream or in the system, the switch wired incorrectly, or the resistor is burned. The 6V system will handle a 8V battery without any trouble. Inspect your wiring. If you think you need a switch, we have the OEM 3 position switches in stock on exchange. Drop us a line if interested...
Steve@B&B Custom Circuits

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Texas Denny

03-22-2006 20:50:30




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 Re: wd battery over charge in reply to yorkie, 03-22-2006 18:10:34  
You got a ton of advice that is good here. Apparently, you have the cutoff relay and have not converted to a voltage regulator. The light switch concept is as follows. In one position, full battery voltage is provided to the field and the generator charges at max. In another position, a resistor on the switch limits the voltage and current to the field so that it charges at a slower rate. In the third position, the lights are on. If you stay with 8 volt, you should buy a regulator and bypass the light switch. The additional voltage in an 8 volt system will cause additional current to flow through the switch resistor and cause premature failure.

One of the respondants suggested that 6 volts will crank the engine. If it isn't cranking properly, you likely have poor battery cables and/or poor connections as he said. If the cables are 0 gauge of 00 gauge, you should have no problem. If they are 1 gauge, they might work but it is shakey. Smaller than that (4 or 6 guage), they won't work.

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tery

03-22-2006 19:31:43




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 Re: wd battery over charge in reply to yorkie, 03-22-2006 18:10:34  
Hi Just bought a wd allis from a dealer and they put a brand new 8 volt battery in it before they delivered it. Have talked to mechanics that tell me the 8 volt in a six volt system should cause no problems at all. I got a owners manual when I bought the tractor. You see the light switch on the tractor is actually somehow supposed cause the charging system on the tractor to charge at different levels depending on how far out you have it pulled. when it is pulled all the way out the system is supposed be on fast charge at about 30 amps I believe and is not supposed to be positioned there unless the battery is low. The light switch is supposed to have three positions. The first two should only cause the system to charge normaling with the second position turning on the lights. Hope you can make sense of some of this. If you can get ahold of an owners manual it explains all of this. The compression problem is out of my league. But I do know the 8 volt battery in my wd spins it over very well. So something is not right. Is the tractor timed right?

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steve(ill)

03-22-2006 19:13:38




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 Re: wd battery over charge in reply to yorkie, 03-22-2006 18:10:34  
most 6 volt systems do not have a voltage regulator, they have a cutout relay mounted to the generator. if you have that style , then the light switch has a resistor on it that runs the generator "F" wire to ground. If the "F" wire is constantly grounded, then you get full charge all the time. If you do have a voltage regulator, then it might also be stuck where the "F" wire is grounded and full chage constantly.

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old

03-22-2006 19:06:43




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 Re: wd battery over charge in reply to yorkie, 03-22-2006 18:10:34  
I would guess you have a regulator problem. A 6 volt genny should just keep an 8 volt battery charged and thats when your lucky. As far as the light switch I would say you have a short some place in the lights wireing, and or a bad light switch.



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Mike S

03-22-2006 18:23:33




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 Re: wd battery over charge in reply to yorkie, 03-22-2006 18:10:34  
Based on what little I know about WDs (just started tinkering with one) I doubt that you have too much compression for the starter to spin it up on 6 volts. My Ford has a higher compression ratio than the WDs and it cranks fine. I would not, under any circumstances, stick an 8 volt battery in it. I would check the wiring to make sure that I had the proper size on the battery. 6 volts likes big wires, I use 2/0 welding wire so no amps get lost. Clean every connection so that it shines. You might take the starter out and have it checked. Could be dragging some, have a bad bearing, etc. Also, it is possible that the engine was not put together right and the crank shaft bearing surfaces are putting too much pressure on the crank. Lots of things to look at. To recharge an 8 volt battery with a 6 volt generator takes some dinking around with the regulator and without the right tools and skills, you can burn up both of them.

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