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Allis Chalmers Discussion Forum
:

battery drain

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Matt

05-18-2004 06:54:41




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I have an allis D-15. I cannot keep the battery charged. I have replaced the alternator, starter,
voltage regulator, and of course the battery.
I can fully charge the battery and run the tractor for less than 30 minutes when the tractor will die and the battery will be dead. Anybody have suggestings...besides a long ride off a short pier.




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Doug in OR

05-20-2004 10:50:09




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 Re: battery drain in reply to Matt , 05-18-2004 06:54:41  
Put a voltmeter on the battery. While the engine is running, you should have 14 volts at the battery. I am assuming you are using a 12 volt system. If you only have 12 volts here, your charging circuit is defective. Check your generator/regulator or alternator. Good grounding connections are needed - check those too.

If you have the necessary voltage at the battery, follow the wire to your ignition switch. Check the voltage into the switch, and then out of the switch. You should see very little voltage drop. Check this same voltage right at the coil connection. If this is good, disconnect everything from the electrical circuit except the ignition. The tractor should run all day on a charged battery. I suspect that your battery is not charged when you start your day.

One last thing: You coil might be shorted. This is the only thing I could think of in your ignition system that would run your battery down in such a short time. There's an outside chance your condensor could be defective too. Check these things and let me know what you find. I'll take it from there.

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Gene

05-19-2004 23:09:41




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 Re: battery drain in reply to Matt , 05-18-2004 06:54:41  
I've been thinking about this problem for two days.

Alternator. Either it's not working or it's not wired correctly. If the alternator lead/wire is attached to the negative post of the battery - it will discharge the battery in a hurry. If the alternator is wired correctly, with the amp draw described, the ampmeter on the dash would be show maximum charge when the tractor is running. (Is the battery in backwards? Positive to starter, negative to ground)

Also, the amp load (battery discharge) described would almost certainly melt insulation on electrical wires. If the starter were bad,I don't believe it would sustain a 1600 amp hour load. 800 amp hour battey, 1/2 hour discharge, plus the alternator output = over 1600 amp hours. That type of sustained load would melt insulation and/or burn up the starter in a hurry.

There are two circuits involved in this problem. The starting circuit and the charging circuit, with the battery being common to both. Try this. Disconnect, unhook, the wire going from the alternator to the battery. With a freshly charged battery start and run the tractor. If the battery runs down in 1/2 hour the problem is in the starting circuit. If the tractor runs for an hour or two and will start again then the problem is in the charging circuit.

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David in IA

05-19-2004 10:05:36




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 Re: battery drain in reply to Matt , 05-18-2004 06:54:41  
An easy way to test for say a short disconnect the battery neg. cable insert in series a 12v test lamp if current draw is greater than 1 amp it will light the lamp. Then start disconnecting one circuit at a time when the light goes out you have your circuit then trace that circuit to locate the problem.
Hope this helps.



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RussR

05-19-2004 16:46:56




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 Re: Re: battery drain in reply to David in IA, 05-19-2004 10:05:36  
SHOR TED; USE THE LAMP TO FIND YOUR SHORT OR MISWIRE. DOES SOUND LIKE A SHORT IN THE STARTER CIRCUIT TO PULL THE BATTERY SO QUICKLY.



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LWD

05-18-2004 23:25:56




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 Re: battery drain in reply to Matt , 05-18-2004 06:54:41  
12 volt? positive ground?



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steve

05-18-2004 15:13:34




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 Re: battery drain in reply to Matt , 05-18-2004 06:54:41  
Matt, if you drain a battery down in 15 minutes with the alternator at full charge (maybe 50-60 amps) then something must be getting very hot. charge it up again and conect. monitor the starter and alternator and regulator if you have one. something is hot if you are pulling 60 amps to ground. you should see it on the amp meter if it is something other than the starter or alternator. a starter can have a internal short and do the draining. but again, it will get very hot.

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Keith-OR

05-18-2004 18:53:54




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 Re: Re: battery drain in reply to steve, 05-18-2004 15:13:34  
Matt after you start your tractor pull the negative cable off the battery, if tractor dies you are running off of the battery. You have either a defective regulator or alternator. Take the alternator to your local rebuild shop, and have them bench test it for you.
Good luck
Keith



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Dave Grubb

05-18-2004 07:22:45




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 Re: battery drain in reply to Matt , 05-18-2004 06:54:41  
Does the battery go dead in 30 minutes if the tractor is not running and with or without the battery connected? If the battery goes dead with it disconnected the battery has an internal short. If not I would start disconnecting things like the the light switch and such to try and isolate the problem. You could also have replaced a failed part with a defective part i.e.:regulator or alternator or battery.

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Matt

05-18-2004 12:13:19




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 Re: Re: battery drain in reply to Dave Grubb, 05-18-2004 07:22:45  
I can charge the battery, and run the tractor for 15-30 minutes. If I turn the tractor off and try to start it a second time the battery will be dead. Will not even turn over.
If the battery is fully charged and left in the tractor (connected) the battery will be dead by morning. If I charge the battery and not connect it to the tractor the battery will hold a charge.



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Dale(MS)

05-20-2004 10:39:43




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 Re: Re: Re: battery drain in reply to Matt, 05-18-2004 12:13:19  
Matt,Might be that the starter solenoid is not dropping all the way out after you crank the tractor. Charge up the battery and hook up and touch the solenoid after a few minutes and see if its real hot! If its hot, check and see if there is voltage at the side of the solenoid from the ignition switch. If there is not voltage from the ignition switch the solenoid is bad, but if there is voltage there it could be the ignition switch could be hanging up and not letting the solenoid drop out.After the battery runs down and you recharge it, it might crank but I wouldn't operate it til its fixed. That much heat could cause a fire! Something to check, Be careful. Dale

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