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Guess the new alternator is bad, Dell and others...

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Andy - Hammond,

02-18-2002 06:01:34




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Well, I guess the new alternator is bad - it definately not creating a charging field since there is not any magnetic pull with a screwdriver to the back or sides. I tested exactly what Dell advised -

no output from the alternator with just the P2 connection supplied to the BAT - ~0.5 VDC reading with the modified (thanks Dell) digital VOM and same with my trusty old analog. The line from the battery was reading the battery voltage - ~11.75VDC - I cannot explain it. I checked the diode again and verified the proper direction of the install and electron flow in only one direction. It seems to work fine.

Could this really be another bad alternator? Obviously not "sitting on the shelf" as the build or rebuild date is 2/2002. Hmmmm. I guess I will have bring this one down to the shop for testing.
I cannot fathom why I am having so many issues with alternators. Well, the rewiring etc is complete and no juice at the ammeter from the alternator. (as usual)

Oh well, I guess time will tell --
Thanks for the support and assistance.

Andy

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Andy - Hammond, LA

02-18-2002 13:15:56




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Ok -- will try the grounding wire solution today when I get back home. Hope this helps. Should I run it to the battery negative post or all of the way over to the post that the ground is connecting to. I have a feeling that this ground is not so good. Maybe this will help.

;-)
Andy



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Claus

02-18-2002 11:28:00




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Like Phil said, you need to excite the rotating field by supplying current to P1. If the diode is in basss ackwards, then it will not work. Short around the diode to test it. If that does not do it, then if you have the SI series, there will be a small hole in the back of the alternator that you can ground out with a screw driver or other metallic rod... This bypasses the VR. You still need current for P1 Though. P2 is the sense line and is the feedback for the regulator.
Happy Motoring
Claus

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Greg

02-18-2002 10:17:00




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Andy,
I know how aggravating it can be. Keep your chin up and keep swinging. Even though it seem's like you have checked everything, you will find the problem.



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Phil (AZ)

02-18-2002 10:14:47




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Andy
>>>no output from the alternator with just the P2 connection supplied to the BAT <<,

This (what you State) would be Normal, You Must provide an Excite Voltage to start the Charging. Diode to P1 must be connected or a momentary JUMPER from P1 to Battery.

Hope This Helps,



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Dell (WA)

02-18-2002 08:51:24




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Andy..... .if'n yer diode in the P1 line was incorrectly installed, ya wouldn't beable to turn yer engine off.

Ya know, some alternators mounts are insulated for vibration purposes. I don't suppose you've tried grounding yer alternator frame with a seperate ground wire back to yer battery ground cable??

But then on the otherhand, 3 bad alternators innna row isn't impossible, stranger things have happened..... ..Dell

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bj/8n/mt

02-18-2002 07:27:51




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Hey Andy--just have to keep reminding yourself that you are smarter than the tractor.

Three bad alternators in a row sounds unlikely. More likely is something in your wiring is frying the diodes. Has this twelve volt conversion ever worked? Why did you start throwing alternators at it?

Your mileage may vary



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Willard

02-18-2002 07:23:17




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Andy! What dos your firend at the parts store say about theses alternators? Does he check them and verify they are in fact bad? Are you by chance gettin alternators that require a different rotation that what your N is providing? Just a thought, good luck Andy. Willard



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Jim K

02-18-2002 06:09:04




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 Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:01:34  
Andy it sounds to me like you should start looking for a bad ground somewhere, I suppose it's possible to have three bad alternators in a row but highly unlikely. Do you have a good diagram?
Jim K



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Andy - Hammond, LA

02-18-2002 06:19:37




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 Re: Re: Guess the new alternator is bad, Dell and others... in reply to Jim K, 02-18-2002 06:09:04  
I have mentioned a desire to locate if I have a good ground in my other posts. Of course I am following the tried and true nseries - 12V conversion diagram. I am grounding the battery to the frame of the tractor on bolt on the lower side of the tractor behind the dash. Is this where it should be grounded? Any other grounding tips?

Thanks,
Andy



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Jim K

02-18-2002 07:02:37




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 Re: Re: Re: Guess the new alternator is bad, Dell and others... in reply to Andy - Hammond, LA, 02-18-2002 06:19:37  
I am not an "N" expert but just for test purposes I would run a seperate ground wire to alt from bat just to positively rule out ground as a source of trouble.
Jim K



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