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Farmall & IHC Tractors Discussion Forum
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gen output

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in sticks

03-03-2005 14:53:46




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have 12 v gen that maybe not generating volts? it has two leads and spins freely and the belt is tight.how do i check volts at gen terminals with gen at speed on tractor.i have a multi meter.
any and all ideas appreciated




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dr.sportster

03-04-2005 15:10:36




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 Re: gen output in reply to in sticks, 03-03-2005 14:53:46  
This is what i do;remove leads to isolate generator,start motor,momentarily ground field terminal with a jumper lead,place meter between A terminal and ground look for approx. 40 volts.If it is removed it should "motor"with power applied from a battery.



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PA Steve

03-04-2005 10:28:57




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 Re: gen output in reply to in sticks, 03-03-2005 14:53:46  
Another method is to use your meter and find battery voltage with the engine stopped. In order to charge the battery, generator output voltage must exceed battery voltage. Now, with the engine running, put your meter across the terminals on the generator. If the generator voltage is greater than battery voltage, then your generator should be charging the battery. If you have an ammeter in the circuit, the meter should show charge. If you have no way to tell whether or not there is any charging current, pull the cover off of the voltage regulator. The relay that sends current to the battery should be shut. If it is not, there is either a problem with the regulator or the wiring.

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Allan in NE

03-03-2005 15:50:04




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 Re: gen output in reply to in sticks, 03-03-2005 14:53:46  
IS,

Put your voltmeter across the battery. Start the outfit and let the voltage stabilize for a short time (you'll probably see around 14 volts).

Watch the voltmeter and turn on the headlights.

The needle ought to "blink" as the lights come on and then immediately when the regulator kicks in, the voltage should come right back up to where it was before you turned the lights on.

That's how I do 'er anyway, to check both the generator and the regulator.

Allan

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