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Farmall & IHC Tractors Discussion Forum
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voltage regualtor needed

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Pat-CT

01-07-2007 19:28:48




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is the voltage regulator needed?? what does it do ?




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KEB

01-07-2007 20:06:50




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 Re: voltage regualtor needed in reply to Pat-CT, 01-07-2007 19:28:48  
Keeps the generator or alternator from overcharging the battery. Older generators had cutout relays, which basically disconnect the generator from the battery when its not running, so that the battery doesn't discharge through the generator. Maximum current was limited by the generator itself, and it would take quite a while to charge a fully discharged battery.

Voltage regulators work by varying the current through the field winding, whether on a generator or alternator. A regulator will reduce field current if the output exceeds either the maximum current the generator/alternator can provide without overheating, or if the output voltage exceeds what the battery can safely accept.

Modern alternators have the voltage regulator built in, and use solid state electronics instead of relays, but they all perform the same function.

Keith

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Janicholson

01-07-2007 19:37:22




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 Re: voltage regualtor needed in reply to Pat-CT, 01-07-2007 19:28:48  
Yes. It is on all tractors with a two brush generator, or an alternator. Early forties and earlier had a similar device called a cutout relay) If the tractor is equipped with a generator (or old alternator with a external regulator) it will be a rectangular box mounted (usually) where it can be accessed. If the tractor has been modified with an alternator, it will most likely have a regulator inside the body of the alternator. A old autmotive book covering electrical systems is a great reading source for old Iron. I recommend that you purchase one and dive in. JimN

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