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Bill_MN 
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Joined: 12 Sep 2009
Location: Sioux Falls, SD
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 Topic: testing generator
Posted: 24 Aug 2011 at 10:24pm |
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Battery keeps going dead on my WD, it might be the battery but I would also like to check the condition of the generator system (Two-brush with VR). Where do I put the multimeter points to see if the generator is charging the battery, And how many volts should I have? Is there another method for testing the genny?
Edited by Bill_MN - 24 Aug 2011 at 10:25pm
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Tedin NE-OH
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Joined: 30 Mar 2011
Location: OH
Points: 177
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Posted: 24 Aug 2011 at 10:31pm |
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Watch the amp meter.
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Orange Blood
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Joined: 29 Nov 2010
Location: ColoradoSprings
Points: 4053
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Posted: 24 Aug 2011 at 10:33pm |
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Well the correct way to verify the generator is to use a current meter, just like the oem one on the tractor, or at the very least a current probe. What I would do with a volt meter is measure the battery voltage with the engine running vs. stopped. If the voltage is higher running then stopped, the genny is at least trying to work, the question is how much higher. Each cell of a lead acid battery typically runs about 2.2 volts, so a fully charged 6 volt will run around 6-1/2 volts, and a 12 volt batt will run around 13.6 volts. Charging voltage should be just above the respective voltage to charge the battery, anthing less than the above voltage will discharge the battery. I hope this is enough to get you started.
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Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7
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stray
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Joined: 16 Aug 2011
Location: Tipton, Missour
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Posted: 25 Aug 2011 at 3:55am |
Using a volt meter, first make sure the battery is charged good, and then let the static charge dissipate for a few minutes. Then check the battery voltage with the engine off. Start the tractor and let it run 3 to 5 minutes at about ½ throttle, then check the battery voltage with the tractor running. Compare to the 2 voltage readings if the non running is 12 volt then the running should be 1.5 to 2.5 volts higher, on a 6 volt the reading will be .75 to 1 volts higher. A generator take longer to get the voltage up in the battery than an alternator you don’t need to let it run for a few minutes when using an alternator. Also the belt tension is more critical on a generator then on an alternator. If the readings aren’t right be sure to take both the generator and regulator to the rebuilders or part store to have check.
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1969 190XT series 3
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Dusty MI
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Joined: 13 Sep 2009
Location: Charlotte, Mi
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Posted: 25 Aug 2011 at 7:27am |
An old simple way. Take the belt off of it. Take the cover off the cutoff and hold the contacts closed, the generator should run like an electric motor but much slower.
Dusty
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917 H, '48 G, '65 D-10 series III "Allis Express"
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DonDittmar
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Posted: 25 Aug 2011 at 8:35am |
 Dusty MI wrote:
An old simple way. Take the belt off of it. Take the cover off the cutoff and hold the contacts closed, the generator should run like an electric motor but much slower.
Dusty |
Thats the first test I do when working on a GEN. Put power to the A terminal and ground the F terminal and it should run like a motor. I do this with the GEN off and pinched in the vise and a battery or battery charger as my power source. To test with it on the tractor, once I have verified the cutout is closed I jump the F terminal to ground, should make it go to full charge
All these test are assuming the GEN is an A type
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
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Posted: 25 Aug 2011 at 10:26am |
Here is a site on generators and regulators and tests and repair .. all the info you may need . Is for Chev but covers all Delco / AC systems .
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Bill_MN
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Joined: 12 Sep 2009
Location: Sioux Falls, SD
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Posted: 25 Aug 2011 at 10:09pm |
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Thanks, I should have enough info to get started. As I said before this is a two brush generator with a voltage regulator (VR), not a cutout system.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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DonDittmar
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Joined: 15 Sep 2009
Location: MIllersburg, MI
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Posted: 26 Aug 2011 at 6:02am |
Bill_MN wrote:
Thanks, I should have enough info to get started. As I said before this is a two brush generator with a voltage regulator (VR), not a cutout system. |
All gens have a cutout otherwise when BAT voltage is more than GEN output, the battery would discharge through the GEN(try to run gen like a motor) The cut-out is a seperate realy inside your VR. Pull the cover off the the VR and you will see 2 sets of points. The one with the heavy windings is the cut-out.
An alternator doesnt need a cutout beacuse it rectifies to DC output by sending the current through a diode trio and heat sink(known as the rectifier). I diode is an electrical check valve which will let current out of the alt, but wont allow it in.
Take an alt apart and change the diode trio and you can make it charge + ground systems.
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
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Posted: 26 Aug 2011 at 7:21am |
Boy these guys are gettin' good! Makes an electrical guy like myself wanna cry.... LOL!
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 28 Aug 2011 at 6:54pm |
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Yup, steve they even like the ammeter...
In theory the fully charged starting battery floats at 2.35 volts per cell, so 7.1 volts on a 6 volt and 14.2 on a 12 volt. Generator regulators don't hold the voltage that precisely though. Voltage rising at the battery terminals is best tested by digging the meter prods into the bettery posts themselves because an open connection can show adequate voltage for charging but if the battery posts are corroded (and they need cleaning nearly twice a year on a 6 volt to keep it starting and charging) the battery won't be seeing that charging voltage or taking a charge.
Gerald J.
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