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Harry Ferguson Tractors Discussion Forum
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Battery Drains Quickly

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Mick

06-01-2004 19:13:51




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A couple of months ago, I bought a 1951 TO 30 that starts immediately, runs great, and works like it's new. My problem is that if I leave the battery cable connected, it drains the battery in a few hours to the point it won't turn the engine over. The man I bought it from told me that he always disconnected the battery every time he stopped because he never could find the problem. (If everyone who sold used machinery were as honest as this guy, the world would be a better place.) Anyway, does anyone have an idea as to what I might do? I thought about installing a knife-switch on the battery cable, but that seems like overkill. Anybody out there ever experience this?

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txblu

06-02-2004 08:28:56




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 Re: Battery Drains Quickly in reply to Mick, 06-01-2004 19:13:51  
If any of the rectifier diodes in the alternator are shorted, you could bleed current back thru the alt to gnd.

Disconnect the big red wire from the alternator to the battery (maybe connected at the starting solenoid terminal). See if that stops it.
----- ----- ----- ----- ---
Or (better yet) if you have a multimeter, lift off your non-grounded battery lead (hot one) from the battery terminal and ohm it to ground. If your battery is draining, you will get a resistance reading (to ground).

Then systematically start disconnecting things one at a time until it quits showing some resistance.

You may read 100k or so reverse leakage thru the diodes but any reading of say 10k or less should be investigated.

Other possibilities is leaking switch (light or ignition) or dist primary wired to batt, not ign switch, or surface crud from an electrical terminal to ground.

Also, if your battery is really cruddy and moist, you could be leaking current across it from + to - terminals. Thinking out loud: This is not the problem as it wouldn't be affected by removing the cable which you said stops the discharge.

Mark

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Mick

06-03-2004 07:56:19




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 Re: Re: Battery Drains Quickly in reply to txblu, 06-02-2004 08:28:56  
Mark, thanks for this info. I'll give it a try.



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txblu

06-03-2004 08:12:06




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 Re: Re: Re: Battery Drains Quickly in reply to Mick, 06-03-2004 07:56:19  
10-4



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Vern-MI

06-02-2004 05:08:13




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 Re: Battery Drains Quickly in reply to Mick, 06-01-2004 19:13:51  
Has it been converted to alternator? Could be the energizing circuit not wired properly during the conversion.



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Mick

06-03-2004 07:53:46




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 Re: Re: Battery Drains Quickly in reply to Vern-MI, 06-02-2004 05:08:13  
Yes, it's been converted. I should have mentioned that. I'll check out your suggestion. Thanks.



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Ray,IN

06-01-2004 19:42:17




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 Re: Battery Drains Quickly in reply to Mick, 06-01-2004 19:13:51  
You can install a disconnect switch as you said, which will work, or take the time to locate the short. It depends entirely on you. If you decide to locate the short with a VOM, try beginning with the negative battery cable and just follow the circuit wiring until you find the fault by disconnecting each terminal(one at a time) and measuring for any current draw progressively through the entire wiring harness.

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Mick

06-03-2004 07:52:02




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 Re: Re: Battery Drains Quickly in reply to Ray,IN, 06-01-2004 19:42:17  
Thanks, I give it a try.



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Jim W

06-01-2004 19:35:14




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 Re: Battery Drains Quickly in reply to Mick, 06-01-2004 19:13:51  
This could be way off because I am only familiar with Lucas electrics, but if it's similar, it could be the cutout relay in the regulator sticking closed.
(At some low rpm the generator doesn't spin fast enough to charge the battery, and the cutout relay opens, otherwise the battery discharges.)
But again, your system could be different. FWIW,
Jim



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Ray,IN

06-04-2004 20:20:29




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 Re: Re: Battery Drains Quickly in reply to Jim W, 06-01-2004 19:35:14  
Jim, the TO series of tractors use battery voltage to power the secondary electrical system needed for sparkplugs when the generator is not supplying adequate power, so the battery is discharging at low(idle) rpm's.



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Mick

06-03-2004 08:04:01




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 Re: Re: Battery Drains Quickly in reply to Jim W, 06-01-2004 19:35:14  
Jim, thanks for your suggestion. I forgot to mention that my TO30 has been converted to 12 volt and has an alternator, so I think it has an internal regulator. As you can see, this electrical trouble shooting is not exactly my area of expertise. Thanks again.



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Jim W

06-03-2004 11:24:12




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 Re: Re: Re: Battery Drains Quickly in reply to Mick, 06-03-2004 08:04:01  
In that case it is actually easier. You can put a switch in the one wire coming out of the alternator.
Also there are now inexpensive switches that go right on your battery post, that just have a big rotary knob, so if you want to disconnect the battery you don't need any tools.
Jim



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Tree Farmer

06-01-2004 20:08:29




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 Re: Re: Battery Drains Quickly in reply to Jim W, 06-01-2004 19:35:14  
I have the same problem with my TO20 and AC H3. I just disconnect the ground cable every time I'm done using it. A little bit of a hassle, but when I had them out in the woods 8 miles from my camp, it was pretty frustrating when the battery was dead. This works for me. TF



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Mick

06-03-2004 07:47:38




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 Re: Re: Re: Battery Drains Quickly in reply to Tree Farmer, 06-01-2004 20:08:29  
Thanks, that may be my best bet.



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