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Allis Chalmers Discussion Forum
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battery drain

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RobJJ

04-12-2007 22:28:41




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I finally got a working ammeter hooked up and see why the previous battery went bad...I have a significant battery drain (discharge) when the engine is not running. What might be the most likely cause? How do I narrow it down? It's been awhile, but seems that someone once upon a time suggested disconnecting the neg lead (since the positive is the ground) and putting a circuit tester light inline between the battery and the now disconnected negative terminal that was removed from the battery and then starting to disconnect downline connections one at a time...when the circuit tester light goes out, that is where the drain is occurring. Do I have that right? Or is there a better way? Thanks

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Texas Denny

04-13-2007 07:01:59




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 Re: battery drain in reply to RobJJ, 04-12-2007 22:28:41  
I was the guy that suggested the method. You paraphrased me well and have the method correct.

The other posters are correct in that the cutoff is the most logical source of the drain. But it could be so many things. Now that you have a working ammeter, it should do the job as well as a light.

If you are having a drain, you should see small sparks when you remove either battery cable - another method of indication.

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Kent of SWMO

04-13-2007 06:26:24




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 Re: battery drain in reply to RobJJ, 04-12-2007 22:28:41  
Two screws remove the cover on the cut-out relay. Inside you will find a large relay with a set of contact points if the point are stuck together you have found your problem. You should replace the cut-out. A Allis/Agco deler can help you. A full line autmotive part store sahould be able to help BUT some Like AUTO-ZONE do not know what Farm Equipment is.

Kent



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RobJJ

04-13-2007 11:04:53




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 Re: battery drain in reply to Kent of SWMO, 04-13-2007 06:26:24  
If I find the points are stuck closed, can I try to free them up and see if they start to work properly, or do I need to find a replacement?



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Kent of SWMO

04-14-2007 08:55:24




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 Re: battery drain in reply to RobJJ, 04-13-2007 11:04:53  
Normally once the contact point start sticking you will continue to have problem when you unstick them. You can try cleaning them up BUT few people including me have the burnishing files need to clean up SILVER contacts You might type cleaning with a rough paper like posted board or a thin cardboard. If it were mine I would convert to 12 volt negative ground with an alternator. I did this to my 1967 Allis/Gleaner C-II. It was 12 volts I just changed the grounding system and went to the alternator. Kent

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Toby(NC)

04-13-2007 05:29:18




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 Re: battery drain in reply to RobJJ, 04-12-2007 22:28:41  
If the tractor has a generator and a cut-out relay, the box mounted on top of the gererator.
If the relay inside the box is stuck in the closed position there will be a battery drain. You can remove the cover and check.



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RobJJ

04-13-2007 06:00:49




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 Re: battery drain in reply to Toby(NC), 04-13-2007 05:29:18  
It does have a generator with cutout. Is removing the cover on the cutout straightforward (I'm at work and can't check at this time)? If so, with the cover removed, will it be obvious if the relay is open or closed? If closed, then what? Can this be fixed, or do I have to replace the cutout? If replace is the only option, can anyone suggest a source?

Thanks,

Rob



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Jerry Coulter

04-13-2007 04:47:06




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 Re: battery drain in reply to RobJJ, 04-12-2007 22:28:41  
Sounds very logical. We once sold a new D17 that had such a problem which was traced to the starter solenoid. Replaced the solenoid, problem cured.



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