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Electrical short on DC

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BLMN

07-17-2004 16:36:37




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I need help I have restored and have my 1950 DC running the problem is after it runs about a half hour the wire from the generator starts to overheat and melts all the coating off the 12 gauge wire. Nothing is touching it to short it out that I can find it has now happened 3 times. The generator is 12 volt it has all been gone through with a new voltage regulator, it is now positive ground and has been polorized to match. Last time it did it I took the generator back to the electric motor shop they checked it out said it was putting out 11 volts. Any ideas to help? Thanks.

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Sam#3

07-18-2004 07:36:44




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 Re: Electrical short on DC in reply to BLMN, 07-17-2004 16:36:37  
First, The generator should generate at mininum 13.5 volts, nearer 14.5 would be better AND maintain that voltage under load up to about 20 amps.
Now for the problem at hand, 'overheating charge wire after thirty minutes.' Does the ampmeter reading go up(or show a high discharge?) Does the wire between the meter and the battery overheat? Does the battery maintain charge? Remember, every electrical appliance, except the starter, on the machine is fed from the charge/discharge lead somehow. Check all the wires including lights and ignition for pinches and bare spots and last but not impossible is a short in the generator or regulator drawing current from the battery.

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BLMN

07-18-2004 10:43:47




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 Re: Re: Electrical short on DC in reply to Sam#3, 07-18-2004 07:36:44  
It is the wire between the meter and the generator that melts. The gauge is new and it bounces back and forth from 10-15 amps on the gauge, it never shows a discharge and it has maintained and held a charge since I got the tractor running, new battery. How can I check for a short in the regulator or the generator? I am going to replace the melted wire today and plan to leave the light unconnected to see if that is the problem. Thanks for the feed back.

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Sam#3

07-20-2004 04:34:06




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 Re: Re: Re: Electrical short on DC in reply to BLMN, 07-18-2004 10:43:47  
Without being there I run out of ideas. However, I'm still suspect of the generator. Maybe worn brushes allowing the holder to drag or a weak spring allowing the brushes to bounce.
I wish you luck. Let us know what you find.



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BLMN

07-20-2004 04:41:28




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 Re: Re: Re: Re: Electrical short on DC in reply to Sam#3, 07-20-2004 04:34:06  
Thanks for the input. I think I will take it to another motor shop and get it checked out.



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Jerry W

07-17-2004 21:32:56




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 Re: Electrical short on DC in reply to BLMN, 07-17-2004 16:36:37  
First off, any electrical shop that told you that a generator put out 11 volts should not be in the electrical business. Generators put out amps, volts are the result of resistance. Now if they told you that it put out a maximum of 11 volts that is another story. A 12 volt generator that can only achieve 11 volts has a problem. It should hit in the high 13's.

Jerry



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