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Cutting amp output

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Ted

07-08-2003 14:32:56




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Is there a way to lower the amp output of an alternator or a way of burning some of it off to keep my small battery from being overcharged.Thanks




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Bob

07-08-2003 18:46:20




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 Re: Cutting amp output in reply to Ted, 07-08-2003 14:32:56  
One way to do it, which is awkward, is to use a sealed beam headlite in series with the charging lead. The bulb will start out bright, and dim as the battery is charge up.



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RAB

07-08-2003 16:19:38




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 Re: Cutting amp output in reply to Ted, 07-08-2003 14:32:56  
Voltage regulator should prevent overcharge. Should operate at about 14.4 volts.
Alternator current output is designed in by resistance and number of windings on the rotating field etc.
Perhaps you might enlighten us as to what is regarded as too high, and what size the battery you consider might be too be small.
Most cars have a 50 amp, or bigger, alternator on these days along with what I would term a small battery. They seem to be alright.
Regards, RAB

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rod

07-08-2003 20:35:03




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 Re: Re: Cutting amp output in reply to RAB, 07-08-2003 16:19:38  
RAB is correct. An alternator's output voltage is controlled by the voltage reg. Current is self regulatingin on an alternator. Charge rate will be determined by battery condition. Whether the max output of the alternator is 15 amp or 100 amp does not really matter. Charge rate determined by demand / resistance.

Rod



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Ted

07-08-2003 17:23:23




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 Re: Re: Cutting amp output in reply to RAB, 07-08-2003 16:19:38  
Im using a garden tractor battery for weight reasons and I dont want to push 30 or 40 amps into it.



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RAB

07-09-2003 08:33:47




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 Re: Re: Re: Cutting amp output in reply to Ted, 07-08-2003 17:23:23  
If you don't take any thing out, the alternator will put nothing in as long as it's fully charged.
If you are, as I suspect, pulling with it - put on the largest alternator pulley you can get away with, use a larger fan/pump pulley and smaller crank pulley. Maybe jump-start it and run on a torch battery (instead of exciting the alternator).
Seriously, though, if the battery will give enough amps output to crank the engine, it should stand the short term charging to return this energy to the battery.
Finally if you are 'abusing' some old metal by upping the power, lowering the weight, probably over-revving it, I think you can put up with that skinny battery needing replacement occasionally.
Regards, RAB

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kjm

07-08-2003 20:49:06




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 Re: Re: Re: Cutting amp output in reply to Ted, 07-08-2003 17:23:23  
Ted, you might as well add a cut out switch too, (it takes horse power to pull an alt.) lol kjm



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buickanddeere

07-08-2003 19:54:40




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 Re: Re: Re: Cutting amp output in reply to Ted, 07-08-2003 17:23:23  
Put a reostate good for 2 amps and 0 to 25 ohms in series with the field supply to the brushes. Dial in as desired.



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