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Tractor Talk Discussion Forum

Re: OT/Ford

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12-26-2012 20:11:12

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The draw is dramatic and will draw down the battery over night. The dimming of the lights while operating is a key. A short circuit is possible, but it is more likely an issue with the alternator.
Both problems can be caused from a bad bridge diode. in the alt. Loosen but do not remove the nut on the back of the alternator where the large wire attaches. Put your meter between the removed terminal on the battery, as before. Now remove the alt wire. If the draw goes to millivolts, That is the issue. If no change, then removing fuses one at a time is the next step. Set the meter so you can see it from the fuse box. Jim

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12-26-2012 20:25:34

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 Re: OT/Ford in reply to Janicholson, 12-26-2012 20:11:12  
10 1/2 Volts tells it ALL....

That Battery has a bad cell....and they will not start with 10 1/2 Volts..

The "Dimming" of your lights is when the battery drops to 10.5 V and gets Bright when the battery snaps back to 12 V..(all 6 cells working)..

I would try with a New Battery, before I did anything else..! Ron..

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12-26-2012 20:34:05

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 Re: OT/Ford in reply to BushogPapa, 12-26-2012 20:25:34  
A bad battery can have the effect, but the draw on the system, after charging, will take the battery down over night. With respect, Jim

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12-26-2012 20:39:00

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 Re: OT/Ford in reply to Janicholson, 12-26-2012 20:34:05  
He said the Battery showed only 10.5V after he charged it... I would change the Battery..


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12-26-2012 21:06:26

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 Re: OT/Ford in reply to BushogPapa, 12-26-2012 20:39:00  
Woth respect. the way I read the post he charged it normally with the terminal off. It then (and still has, I think) a charge. Jim

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Retired Farmer

12-26-2012 22:40:44

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 Re: OT/Ford in reply to Janicholson, 12-26-2012 21:06:26  
True. When I charged it with the cables both hooked up it still read around ten volts. I disconnected the positive and it charged to 14.7. Haven't checked it today to see if it is still up.

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12-27-2012 02:17:30

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 Re: OT/Ford in reply to Retired Farmer, 12-26-2012 22:40:44  
Had a 79 ford that run the battery down. Put the amp meter in between the positive post and battery. It had a 2 amp draw on it. I started unplugging everything one at a time. Long story short it was the voltage regulator that was drawing the 2 amps. On that truck it was external.

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