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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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1650 Alternator

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Adam Schuh

12-16-2006 10:02:11




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How much voltage should I see at the battery with the tractor running wide open, how much voltage should I read at the alternator? I suspect my alternator is bad, only reading about 12.5 volts and both locations with tractor running.




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Adam Schuh

12-18-2006 14:57:12




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 Re: 1650 Alternator in reply to Adam Schuh, 12-16-2006 10:02:11  
Replaced the alternator today. Everything is charging nicely now. Thanks all of you for your help on this.



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Bob M

12-18-2006 07:28:17




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 Re: 1650 Alternator in reply to Adam Schuh, 12-16-2006 10:02:11  
Adam - With a good alternator should see 14.0 - 14.5 volts at the battery with the engine running. Your 12.5 reading says the battery is not charging.

Presuming your 1650 has the original Delco alternator (external 4-terminal regulator; alternator aux 2-terminal plug has terminals in parallel (like this: I I), there's a resistance wire in the harness between the ignition switch and the regulator. If this wire goes open (which they do on occasion...) the alterator will not work.

Suggest pulling the alternator off an taking it to NAPA, Autozone, etc. where they'll test it for free. If the alternator works on the test stand then be looking for a wiring problem (most likely a break in the resistance wire...), or possibly a bad regulator.

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J Schwiebert

12-16-2006 11:52:17




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 Re: 1650 Alternator in reply to Adam Schuh, 12-16-2006 10:02:11  
If you have the alternator that came withthe 1650 it will have the external regulator which could be the problem. Another little trick is to turn the key on, DO NOT start the tractor and see if a screwdriver will pull toward the bearing on the back end. If it does the field circuit is O. K. Also it may be time to where the alternator needs a good tune up, you know slip rings polished and new brushes and maybe new bearings. I do have an alternator troubleshooting chart somewhere I can e-mail if interested. J.

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Adam Schuh

12-17-2006 04:31:26




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 Re: 1650 Alternator in reply to J Schwiebert, 12-16-2006 11:52:17  
I have the original alternator with the external regulator. I tested the alternator with the tractor running wide open and only read 12.4 volts or so directly on the alternator terminals. I put my meter probes on the ground of the alternator and on the bigger terminal that has a wire connected from it to the amp gauge on the dash. This setup should be eliminating everything but the alternator right? This is why I am guessing alternator is bad.

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ElToro

12-17-2006 06:43:06




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 Re: 1650 Alternator in reply to Adam Schuh, 12-17-2006 04:31:26  
I think you are reading voltage from your battery.
Pull the ground cable off the battery when the tractor is at an idle and see if the engine continues to run. If it quits the alternator isn't charging. Hal



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J Schwiebert

12-17-2006 11:51:16




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 Re: 1650 Alternator in reply to ElToro, 12-17-2006 06:43:06  
Just a second here. Unless you have talked to Adam neither one of has seen the tractor. A couple of weeks ago Adam was asked questions about his ignition switch. I don';t know if this problem started the same time or not but maybe Adam needs to check if he is sending a signal to the regulator so the regulator can energize so it can charge. My 2 cents worth. J.



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J Schwiebert

12-17-2006 06:02:25




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 Re: 1650 Alternator in reply to Adam Schuh, 12-17-2006 04:31:26  
No: The regulator tells the alternator when to charge. That is why you elimante the regulator from the circuit when you test it. I had the same problem with a student in the mechanics class Friday when I subbed over at the career center. You need to feed the alternator to excite it but not with the regulator in the circuit. More questions? J.



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El Toro

12-16-2006 10:35:52




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 Re: 1650 Alternator in reply to Adam Schuh, 12-16-2006 10:02:11  
third party image

I hit the Preview before I entered the picture web site. Hal



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El Toro

12-16-2006 10:30:43




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 Re: 1650 Alternator in reply to Adam Schuh, 12-16-2006 10:02:11  
The output from your alternator should be between 14 to 14.5 volts. I would check the specific gravity in your battery cells. They should be in the 1250 range. They should be close to one another with the readings too. You may have a blown diode in the alternator. Does this alternator have the internal regulator or external?
If its the external, it could be the problem. With the internal you will need to take it to a repair shop. Hal
PS: Here's the hydrometer I use for batteries or antifreeze.

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