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Excessive Charging


 
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Doc in WV
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PostPosted: Sat Oct 06, 2012 2:49 am    Post subject: Excessive Charging Reply to specific post Reply with quote

53 NAA appears to be charging excessively?
After Brush Hogging for about 20 minutes amp meter started showing a charging rate of almost 30 amps. Turned on all lights and rate fell after about 4-5 minutes to around 20.
The battery is in good condition and will start the tractor after setting for two weeks with no Problem. This tractor has always charged well at low RPM 900 or so. The needle in the amp. gage will bounce as the Reg. drops back after starting. Pulling on the lights will cause the reg. to increase and the amp.needle will stablize at above 20amps.then drop to 4-5 This is a stock 6 volt system.The question is: Do I have a defective Voltage Reg. or is it possible to have a wire on the wrong terminal? I replaced the Reg. about a year ago. Long post I know guys, but trying to supply as much info. as possible. Tractor rewired by PO and looks professional?
 
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Bill Rowles
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PostPosted: Sat Oct 06, 2012 4:41 am    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

Check for broken or loose wires between V.R. and generator. If none, problem must be a failure in the V.R.. I don't know if they can be rebuilt/repaired or if the only remedy is a new unit.
Maybe someone on the forum can advise about checking for stuck relay contacts or cleaning contacts, ....when I do that with electrical devices I sometimes win and usually don't gain anything because I don,t have the tools or knowledge to do it right.
 
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JMOR
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PostPosted: Sat Oct 06, 2012 4:57 am    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

Doc in WV wrote:
(quoted from post at 06:49:51 10/06/12) 53 NAA appears to be charging excessively?
After Brush Hogging for about 20 minutes amp meter started showing a charging rate of almost 30 amps. Turned on all lights and rate fell after about 4-5 minutes to around 20.
The battery is in good condition and will start the tractor after setting for two weeks with no Problem. This tractor has always charged well at low RPM 900 or so. The needle in the amp. gage wsill bounce as the Reg. drops back after starting. Pulling on the lights will cause the reg. to increase and the amp.needle will stablize at above 20amps.then drop to 4-5 This is a stock 6 volt system.The question is: Do I have a defective Voltage Reg. or is it possible to have a wire on the wrong terminal? I replaced the Reg. about a year ago. Long post I know guys, but trying to supply as much info. as possible. Tractor rewired by PO and looks professional?
while showing overcharging situation, measure battery voltage. If truly overcharging for extended time, it will be 15 volts or more. What do you measure? Disconnect FIELD wire and see if condition goes away. Did it?
 
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teddy52food
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PostPosted: Sat Oct 06, 2012 5:21 am    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

Look for something grounded in the field circuit. Could be the stud of the generator or bare wire.
 
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Jubilee85
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PostPosted: Sat Oct 06, 2012 5:26 am    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

I had this problem in an old Ford torino 30 years ago, bad ground was the cause, had replaced the VR and BAT and seemed like everything else. The ground strap was frayed to the point that it was trying to charge a car through a couple of hairs of wire.

Pull off the ground wire, clean all spots, make em bright and tight. Check all connections report back
 
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Dean
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PostPosted: Sat Oct 06, 2012 12:28 pm    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

Most likely the generator is "full fielded."

This condition can be caused by reversal of either the ground or field wires (not both, simultaneously) at either the generator (most likely) or VR, or stuck contact(s) in the VR.

Dean
 
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Dean
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PostPosted: Sat Oct 06, 2012 12:29 pm    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

Bingo.

Dean
 
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JMOR
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PostPosted: Sat Oct 06, 2012 1:42 pm    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

Dean wrote:
(quoted from post at 16:28:20 10/06/12) Most likely the generator is "full fielded."

This condition can be caused by reversal of either the ground or field wires (not both, simultaneously) at either the generator (most likely) or VR, or stuck contact(s) in the VR.

Dean
hey, fellers, he has a jubilee, not an N. remember, that means that to full field his type B generator, he needs 6volts on field, not ground. Exactly why I told him to disconnect the field wire.
 
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souNdguy
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PostPosted: Sat Oct 06, 2012 1:43 pm    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

find it yet?

full fielded?

stuck vreg field contact?

bad ground ref from vreg to chassis?
 
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JMOR
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PostPosted: Sun Oct 07, 2012 7:28 am    Post subject: Re: Excessive Charging Reply to specific post Reply with quote

JMOR wrote:
(quoted from post at 08:57:49 10/06/12)
Doc in WV wrote:
(quoted from post at 06:49:51 10/06/12) 53 NAA appears to be charging excessively?
After Brush Hogging for about 20 minutes amp meter started showing a charging rate of almost 30 amps. Turned on all lights and rate fell after about 4-5 minutes to around 20.
The battery is in good condition and will start the tractor after setting for two weeks with no Problem. This tractor has always charged well at low RPM 900 or so. The needle in the amp. gage wsill bounce as the Reg. drops back after starting. Pulling on the lights will cause the reg. to increase and the amp.needle will stablize at above 20amps.then drop to 4-5 This is a stock 6 volt system.The question is: Do I have a defective Voltage Reg. or is it possible to have a wire on the wrong terminal? I replaced the Reg. about a year ago. Long post I know guys, but trying to supply as much info. as possible. Tractor rewired by PO and looks professional?
while showing overcharging situation, measure battery voltage. If truly overcharging for extended time, it will be 15 volts or more. What do you measure? Disconnect FIELD wire and see if condition goes away. Did it?
Us humans can't keep from making mistakes.....that 15v quoted above should read 7.5v or more.
 
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