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Farmall & IHC Tractors Discussion Forum
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Not alot of charging? on w4

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Bob Quale

09-25-2004 09:30:00




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My w-4 has a new generator, regulator and belts, It only charges at 1/2 throttle and above, does this seem right to you? I put a volt meter from the A terminal to ground and all I ever get out of it is 6.4V and that is above 1/2 throttle. If I ground the F terminal I so no difference.

It is 6v pos ground with no modifications.

What to do?

Thanks Bob




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El Toro

09-25-2004 18:15:41




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 09:30:00  
Hi Bob, BobM has an excellent flow chart for troubleshooting generators and regulator problems.
He has been very generous to post that.
http://albums.photo.epson.com/j/AlbumIndex?u=4001561&a=30065733&f=0 An output of 8 to 8.5 volts is ok on a 6 volt system. Good Luck, Hal



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jasoninpa

09-25-2004 16:09:39




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 09:30:00  
voltage is not as much concern as amps ive had problems with my Farmall H witch is the same as a W4 tractor if you have a high/low charge control the amp meter should show around 2 amps on low and 12 amps on high to adjust speed at which gen. kicks on you make the point gap in the voltage reg. closer it will take some engine speed to excite the gen. mine you need 1/2 or so engine speed to kick on but then you can go almost to idle and gen. will stay on there is also a resister wire in voltage reg. (if origanal) that wil regulate rate of charging if you replaced the reg. with a newer type that can cause problems because the origanal system is a single wire type and the new style reg. has an excite wire witch i could never get to work properly and ended up having the shop fix my old reg. and now it works fine. if your gen. is putting out a cherge its good and just need to find out why your not get voltage and/or amperage to battery also the high/low switch could be bad or rusted inside and that will cause bad contact.just remember amps are more important then voltage they are slow charging systems 7.5 volts is more then good 6.5 is still exceptable and that would be wide open readings.with amps wide open would be 2 on low 12 on high please. let me know how youu make out or if you need more help i know what its like i pulled my hair out for over a year to get mine fixed right and leared alot along the way.

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Bob Quale

09-25-2004 11:35:11




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 09:30:00  
If I disconect the wires from the a terminal and ground the f terminal, I get 9v at half throttle and 0v at idle, Maybe that all it's supposed to do? Maybe that's why people change to 12v? It would be nice if I didn't have to run it so fast to have it charge.

Any way, please fill me in and get me up to speed.

Bob



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Bob Quale

09-25-2004 10:44:57




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 09:30:00  
At top throttle I am getting 8v. I get 0v at idle. I would think it would produce enough of a charge to keep it self going at idle?

Bob



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Bob

09-25-2004 11:47:42




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 10:44:57  
IMHO, if 8 Volts is all you're getting at fast idle, open circuit, with the field grounded, you have internal generator problems.

The generator needs to deliver about 7.4 Volts, power the ignition and any lighting load, and have enough current left over to recharge the battery, at maybe 1/4 to 1/2 throttle, and it doesn't seem like yours is capable of doing that, and therefore needs to be repaired.

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Bob

09-25-2004 09:48:56




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 09:30:00  
Assuming you have polarized the generator, if you are using an accurate meter, preferably a analog unit, (as digital meters can puke from all the electrical noise generated by these old ignition and charging systems), and you are only getting 6.4 Volts out of the generator with the field grounded, you have a defective generator.

About the only exception would be if you have a battery with a shorted cell, and the generator is charging it's guts out trying to bring the battery up to about 7.4 Volts.

You can check for this by letting the battery sit over night without running the tractor, or charging the battery. The battery voltage should be in the 6.2 to 6.3 volts range. A reading considerably below this would indicate a bad cell.

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Bob Quale

09-25-2004 10:07:47




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 Re: Not alot of charging? on w4 in reply to Bob, 09-25-2004 09:48:56  
The battery seems good. What voltage should I be getting with the field grounded? I am going to polarize again and see if that helps.

Bob



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Bob

09-25-2004 11:31:26




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 Re: Not alot of charging? on w4 in reply to Bob Quale, 09-25-2004 10:07:47  
If it is putting out 8 Volts at high throttle, polarizing it will not help.

It's hard to say what it should put out with the field grounded, as that is dependant on the condition of the battery. With no load (open circuit) the generator may put out 12 Volts or even more with the field grounded, but connected to a battery, the voltage will go up as the battery is charged (overcharged).

When the shop checked the generator, they may have only checked it at a fixed (fast) speed for Volt and Amperage output. If they have an old service manual for the generator, it probably gives a spec (RPM) that it should start charging, and pull in the cutout relay. They may not have checked it in that much detail.

Not charging at low RPM's could be as simple as crud between the commutator bars, or as serious as a partially shorted armature or bad or incorrect field coils.

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