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2N lights and ammeter

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Joel B.

11-01-2001 13:20:00




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Yes, it's me again with ammeter questions. When I have my lights on, I have to increase the output of the generator in order to show a charge on the ammeter. When I turn off the lights, the ammeter jumps up to a little over 10 amps, which I assume is too high. Is it a normal practice to turn up the generator when using lights, and turn it down when not using lights?

What should the ammeter read under ideal conditions?

Thanks in advance,

Joel B.

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yes . . . Dell (WA)

11-01-2001 14:02:35




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 Re: 2N lights and ammeter in reply to Joel B., 11-01-2001 13:20:00  
Joel..... .2N 3rd brush generator system is working just as its suppost to. And that is one of its faults. The 2N does NOT have a voltage regulator as we have come to know 'em. Its just you! and the manually adjusted 3rd brush.

Face it, electrical power has to come from somewhere and has to be all accounted for.

Generally speaking, it takes about 3 amps to run the sparkies. Then each headlight takes about 4 amps to light up for a total of 8 amps. So essentually ya gotta add up all your electrical loads (3+4+4=11) and vola'...the output of the 11 amp generator is all used up and your ampmeter shows 0, and yer not got nuttin' left to put back innna the battery. And you gotta put some amps back innna the battery, to make up for the ones you used to start the tractor.

Ideally, you'd like to charge your 2N battery at about 2 amps.

Bottom line, if'n yer runnin headlights, ya gotta get the 3rd bush set so you ain't draining the battery (ie...set the charge up) and if'n yer just running the daylight, too much charge is gonna boil out all your battery acid and ruin your battery. Sooooo o ya gotta turn down the 3rd brush so you don't burn out yer battery.

Most people are too lazy and/or ignorant about the crudeness of the 2N electrical system, so they just go around buying new batterys....but hey, it works for them..... .Dell,

Who should also mention that there really is a solid state voltage regulator available for the 2N electrical system that works very well, thankyou.

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Dan Hill

06-20-2005 04:27:38




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 Re: Re: 2N lights and ammeter in reply to yes . . . Dell (WA), 11-01-2001 14:02:35  
My Jd tractor has a 3 position light switch.#1 low charge #2 high charge #3 lights on and high charge.I had a 38 Ford car that had a rheostat under the dash that let me set the charge rate while driving.This is a simple set up no body ever mentions.You need a 25 watt 3 ohm rheostat.Set the 3rd brush to full charge.Lift the field wire from under the cut out screw.Splice on a wire long enough to reach the dash, connect it to the center terminal.If you have a 2wire Rheostat connect 2nd terminal to a good ground .On 3 terminal units you can connect to either side terminal to ground. Old variable speed heater controls work fine if you have one.When the lights are on adjust for a slight charge charge on the ammeter.Your battery will last longer at low charge rates.Any thing over 5 amps causes gassing and water loss.This is why battery trays rot out.

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Ed-Illinois

11-01-2001 13:49:21




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 Re: 2N lights and ammeter in reply to Joel B., 11-01-2001 13:20:00  
You uncovered why the 8N was made with a voltage regulator - the cut-out relay does not regulate voltage so if you want to use the lights extensively, you must turn up the output. I have an after market voltage regulator on my 2N (see link below) which allows me to use the lights ith regularity and not have to mess with the generator output.

If you get 10 amps charge you will boil off the water from the batt. About 3 amp charge is good, since the ammeters are not that exact.

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