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Farmall & IHC Tractors Discussion Forum
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Increasing Generator to 8 volts

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Ted

03-04-2004 14:42:00




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I have a Farmall A and would like to install an 8volt battery to give the starter some extra umph (I rebuilt the engine and added high compression pistons). I know that I need to increase the voltage output of the generator to keep the battery at 8v. Can anyone tell me how?

Thanks




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Bob M

03-05-2004 10:41:06




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 Re: Increasing Generator to 8 volts in reply to Ted, 03-04-2004 14:42:00  
Ted - The answer here is “it depends”! If the charging system is manually-regulated (has a simple cutout relay and a 4-position light switch) simply leave the light switch on the “H” (high charge) position. The existing setup will charge your 8 volt battery with no particular difficulty. However if your tractor is a later model with a voltage regulator (or had a cutout replaced with a regulator), the regulator's set point will need to be tweaked up to about 9.6 volts for it to supply a reasonable amount of charge current - exactly as Buzzman and Mark suggest.

BUT....as long as your starter and battery cables are in good condition you shouldn’t need an 8 volt battery in the first place. A healthy 6 volt battery will easily spin your higher compression A engine. Often a “slow crank” problem is traced to the battery cables and connections. If the cables are original, good chance they have high resistance from internal (hidden) corrosion. And if the cables have been replaced, many times the replacement cables are several wire gages too small. If either of these situations apply, replacing existing cables with new ones of the correct gage can work wonders.

Bottom line is it’s generally more prudent to spend $$ getting the cranking system back into good order than to spend the same $$ on an 8 volt battery “band aid fix”.

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Pop

03-04-2004 17:16:55




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 Re: Increasing Generator to 8 volts in reply to Ted, 03-04-2004 14:42:00  
If the generater is working all right you do not have to do anything to it .



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Buzzman72

03-05-2004 05:21:51




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 Re: Re: Increasing Generator to 8 volts in reply to Pop, 03-04-2004 17:16:55  
Think about it for a second...the generator generates the current, but it's the voltage regulator that...(all together now)...regulates the voltage. So to change the output of your generator to 8 volts, you would have to change the point at which the voltage regular contacts open...the point at which it REGULATES the voltage...and change it to 8 volts. Never done it myself, but I would think that, with a somewhat discharged battery and a voltmeter to monitor at which point the contacts open...and an insulated screwdriver to make the adjustment...it probably wouldn't be THAT hard.

But that's just my OPINION. I've been wrong before...after all, I'm married.

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Mark

03-05-2004 06:03:36




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 Re: Re: Re: Increasing Generator to 8 volts in reply to Buzzman72, 03-05-2004 05:21:51  
I'm married too but that hasn't been a mistake for the last 42 years. Otherwise I am in agreement with you.

To charge a battery, seems to me that designers set the regulator so that the battery gets about 20% more voltage than it's rating and this extra voltage is what pushes currrent into it at some reasonable rate. If the regl was set to exact batt volts, it would take an infinitely long time to achieve full charge. So a regulator for a 6 v system is set to 7.2 volts as is a 12v set to 14.

Then the current part of the regulator is set to some reasonable current 20 to 40 amps max depending on voltage of system and away we go.

Granted, the generator could go nuts and supply lots of V's and A's but that is not what you want if you want the system to survive.

Sooooo ooooo how ya gonna cram current into an 8 volt battery with an energy source set to a max of 7.2 volts?

Mark

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