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Tractor Talk Discussion Forum

Battery in my Workmaster

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yobill

10-22-2004 06:42:40




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A few weeks ago my battery was low and my tractor wouldn"t start, so I charged it and ran it for a few days fine. After not using it for a week it died again so I replaced the battery and it started righ up. After not using it for 2 weeks it died again. It is a converted 12 volt tractor. What should I look at that is causing this?




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Rod F.

10-22-2004 19:36:32




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 Re: Battery in my Workmaster in reply to yobill, 10-22-2004 06:42:40  
I'm with RAB. Get a multimeter, and OHM it out. Simple answer is that you have power going to ground. Check each circuit, and see which one is drawing when it shouldn't.

Rod



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pat w

10-22-2004 11:11:37




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 Re: Battery in my Workmaster in reply to yobill, 10-22-2004 06:42:40  
If you have a one wire alternator hook-up, you have to rev the engine up to about 1500 rpm at start up to get the alternator to start charging. Once the alt has started charging, you can lower rpm. If you have a voltmeter installed instead of an ampmeter, it is very obvious when the alternator starts charging. If you have a three wire hook-up, then you should do as the previous posts suggest.

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RAB

10-22-2004 08:30:13




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 Re: Battery in my Workmaster in reply to yobill, 10-22-2004 06:42:40  
You need to be looking for where the current is draining to. If it takes, say 100 hours to drain the battery you are losing about 1% of the battery capacity per hour so the leak would be about one amp for a 100 amp hour battery, or 12 ohms to ground. Should not be beyond most people to find this drain using an amp meter or volt meter or ohm meter. Alternatively, you could find it by disconnection of all circuits and then adding some back until the fault re-occurs.
RAB

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Coloken

10-22-2004 07:27:53




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 Re: Battery in my Workmaster in reply to yobill, 10-22-2004 06:42:40  
Sounds like the alternator is draining it. Read all (or maybe just some, since there has been many)of the posts here on converting to alternators and how to hook up the wiring with a diode or a switch that unhooks it when off.



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txblu

10-22-2004 12:18:54




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 Re: Battery in my Workmaster in reply to Coloken, 10-22-2004 07:27:53  
Ken,

The rectifier diodes (6 ea) in the alternator do that for you (When they're good). In a generator system, the points in the VR have to open to disconnect the batt.

The diode installation (the forum was yakin about) was to keep the alternator output from coming back thru the control line to supply enough power to operate the ignition coil at low rpm's and without it, the engine continues to run with the key off.

I have one that does that and I'm too lazy (don't have one) to install one.

Mark

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Coloken

10-22-2004 14:21:30




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 Re: Battery in my Workmaster in reply to txblu, 10-22-2004 12:18:54  
Sorry, your wrong on one model. I was used to the other type and had to learn this the hard way. If not hooked to hot, will not charge. If left hooked to battery hot with out diode will run the battery down. Should be done with the "accessory" connection on the switch. If you hook it to the switch "on" (the coil hot) of course the tractor keeps running.



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txblu

10-24-2004 07:39:39




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 Re: Battery in my Workmaster in reply to Coloken, 10-22-2004 14:21:30  
Well for what it"s worth, my 4600 with a Motorola alt (OEM) has an external diode also (as you mentioned). Guess one would have to see the alt schematic to understand why the external diode is required to keep the battery from running down. Most Chev alternators have diode protection on the control lines, internally. The high current part protects it"self as I mentioned.

Mark



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Leland

10-22-2004 07:09:11




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 Re: Battery in my Workmaster in reply to yobill, 10-22-2004 06:42:40  
Your alt might be causing this have had then short out and keep drain batterys right down or you wired it up wrong.



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Paul in Mich

10-22-2004 14:37:00




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 Re: Battery in my Workmaster in reply to Leland, 10-22-2004 07:09:11  
Maybe he can send his alternator to an electrical specialist on a Lancaster farm. Tsk, Tsk, Tsk.



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txblu

10-22-2004 09:36:18




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 Re: Battery in my Workmaster in reply to Leland, 10-22-2004 07:09:11  
Alternator suspect?

If you ever (even for a second) put negative voltage on your alternator output (to the battery ) wire, your rectifier diodes inside are shorted. Bleeds the batt power out to the chassis.

Mark



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